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UserControls aren't displayed properly in ListBox when added from Code-behind (C#, WPF)

I got a simple UserControl that is basically just a Grid with 6 Columns and a bunch of TextBlocks.
XAML:
<UserControl x:Class="MyApplication.TimeAccountItem"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:MyApplication"
mc:Ignorable="d">
<UserControl.Resources>
<local:TimeSpanConverter x:Key="TimeSpanConverter"/>
<Style TargetType="TextBlock">
<Setter Property="FontSize" Value="14"/>
<Setter Property="Margin" Value="10,5"/>
<Setter Property="TextAlignment" Value="Center"/>
</Style>
</UserControl.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="48"/>
<ColumnDefinition Width="2*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" x:Name="tb_Id" Text="{Binding User, FallbackValue=0}"/>
<TextBlock Grid.Column="1" x:Name="tb_Employee" Text="{Binding Alias, FallbackValue=Employee}"/>
<TextBlock Grid.Column="2" x:Name="tb_Updated" Text="{Binding Updated, StringFormat=dd.MM.yyy, FallbackValue=00.00.0000}"/>
<TextBlock Grid.Column="3" x:Name="tb_Total" Text="{Binding Total, Converter={StaticResource TimeSpanConverter}, FallbackValue=00:00 h}"/>
<TextBlock Grid.Column="4" x:Name="tb_Claimed" Text="{Binding Claimed, Converter={StaticResource TimeSpanConverter}, FallbackValue=00:00 h}"/>
<TextBlock Grid.Column="5" x:Name="tb_Remaining" Text="{Binding Remaining, Converter={StaticResource TimeSpanConverter}, FallbackValue=00:00 h}"/>
</Grid>
</UserControl>
CS:
public partial class TimeAccountItem : UserControl
{
public TimeAccount content { get; set; }
public OvertimeListBoxItem(TimeAccount timeAccount)
{
content = timeAccount;
this.DataContext = content;
}
public OvertimeListBoxItem()
{
InitializeComponent();
}
}
On my MainWindow I got a ListBox where I want to "output" those UserControls.
When I do this in XAML everything works fine.
<ListBox Height="400" Margin="10,0" HorizontalContentAlignment="Stretch" BorderThickness="0" Name="listbox">
<local:TimeAccountItem/>
<local:TimeAccountItem/>
<local:TimeAccountItem/>
<local:TimeAccountItem/>
<local:TimeAccountItem/>
</ListBox>
However not from Code-behind
foreach (TimeAccount ta in timeAccountList)
{
listbox.Items.Add(new TimeAccountItem(ta));
}
I hovered one of the Items to show what happens. Already gave my UserControl a fixed Height instead of Auto but this didn't help either.
What am I doing wrong here?
Thanks in advance!

The UserControl constructor with TimeAccount argument is missing an InitializeComponent call:
public TimeAccountItem(TimeAccount timeAccount)
{
DataContext = timeAccount;
InitializeComponent();
}
You should however not be doing this at all.
Instead, declare an appropriate ItemTemplate:
<ListBox ...>
<ListBox.ItemTemplate>
<DataTemplate>
<local:TimeAccountItem/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Then remove the explicit DataContext assignment from the UserControl
public partial class TimeAccountItem : UserControl
{
public TimeAccountItem()
{
InitializeComponent();
}
}
and assign a collection of data items instead of UI elements to the ListBox's ItemsSource property:
listbox.ItemSource = timeAccountList;

How to bind class properties in expander header when grouping items in listview in wpf

I'm grouping the items in listview as shown here. Now I want to bind some of my class properties in the expander header (group header), I'm not able to bind any properties from my class in the <ListView.GroupStyle> section but able to bind properties in <ListView.View>.
Code what I've tried:
<UserControl x:Class="ClientAccessTool.CasesAndTasksDetailsControl"
xmlns:core="clr-namespace:ClientAccessTool.Core;assembly=ClientAccessTool.Core"
DataContext="{x:Static core:SiteListViewModel.Instance}"
>
<UserControl.Resources>
<CollectionViewSource x:Key="groupByCases2" Source="{Binding SelectedSite.CasesAndTasksList}" >
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="CaseName" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
</UserControl.Resources>
<Grid>
<ListView x:Name="lvCasesAndTasks"
ItemsSource="{Binding Source={StaticResource groupByCases2}}">
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Border Margin="3" Width="383" HorizontalAlignment="Left" >
<Expander x:Name="lvExpander" IsExpanded="True"
Style="{StaticResource ExpanderStyle3}" >
<Expander.Header>
<Grid VerticalAlignment="Center" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Viewbox Height="23" Margin="5" Grid.Column="0" DockPanel.Dock="Left">
<Image Source="/Images/RedFlag.png" RenderOptions.BitmapScalingMode="HighQuality"/>
</Viewbox>
<Grid Grid.Column="1" MinWidth="250" >
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock Grid.Row="0"
Text="{Binding Name}"
FontSize="18" VerticalAlignment="Center"
FontWeight="SemiBold"
Foreground="Red"
Margin="5"
/>
<StackPanel Grid.Row="1" Orientation="Horizontal" Margin="5" >
<TextBlock Text="Number of tasks:" FontFamily="{StaticResource FontAwesome}" Foreground="Gray"/>
<TextBlock Margin="5 0 0 0"
Text="{Binding CountOfTasks}"
FontFamily="{StaticResource FontAwesome}" Foreground="Gray" >
</TextBlock>
</StackPanel>
</Grid>
</Grid>
</Expander.Header>
<ItemsPresenter />
</Expander>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
c# class:
namespace ClientAccessTool.Core
{
public class Case
{
public string SiteName { get; set; }
public string CaseName { get; set; }
public string CaseDescription { get; set; }
public List<Tasks> ListOfTasks { get; set; } = new List<Tasks>();
public string CountOfTasks => ListOfTasks.Count.ToString() ;
}
}
The item source SelectedSite.CasesAndTasksList is a List of type Case. I want to bind the CountOfTasks property inside the expander header but its not working.

RadioButton grouping not working in WPF when using ItemControl and DataBinding

I am having troubles grouping RadioButtons when using a WPF form and using DataBinding.
If I manually create my controls the behavior is as expected and the user is only allowed to select one item from the radiobutton group (bottom GroupBox), but if I use nested ItemControls to generate my layout and use data binding grouping does not work as expected and a user is allowed to select multiple radiobuttons in one group (top groupBox) as can be seen in this linked screenshot 1.
I have tried binding the GroupName property but fail to somehow find a binding property to use for GroupName property.
Perhaps the Text property of the TextBlock in the same grid row can be used, but I fail to find the proper Binding syntax to reference it.
What would be the way to get grouping to work?
Here is the XAML:
<Window x:Class="RadioButtonMadness.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" Title="MainWindow" SizeToContent="WidthAndHeight">
<Window.Resources>
<Style TargetType="RadioButton">
<Setter Property="Margin" Value="10" />
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="Height" Value="22" />
</Style>
<Style TargetType="TextBlock">
<Setter Property="Margin" Value="10" />
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="Height" Value="22" />
</Style>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions />
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<GroupBox Header="Prognostic factors - NOK">
<ItemsControl ItemsSource="{Binding PrognosticFactors}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Name="PrognosticFactors" Grid.Row="0" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="2*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions />
<TextBlock Text="{Binding Title}" />
<ItemsControl ItemsSource="{Binding Options}" Grid.Column="1">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<RadioButton Content="{Binding Key}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</GroupBox>
<GroupBox Header="Prognostic factors - OK" Grid.Row="1">
<StackPanel>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="2*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions/>
<TextBlock Text="Test4" Grid.Column="0"/>
<StackPanel Orientation="Horizontal" Grid.Column="1">
<RadioButton Content="One"/>
<RadioButton Content="Two"/>
<RadioButton Content="Three"/>
</StackPanel>
</Grid>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="2*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions />
<TextBlock Text="Test5" Grid.Column="0"/>
<StackPanel Orientation="Horizontal" Grid.Column="1">
<RadioButton Content="One"/>
<RadioButton Content="Two"/>
<RadioButton Content="Three"/>
</StackPanel>
</Grid>
</StackPanel>
</GroupBox>
</Grid>
</Window>
As well as the code behind:
using System;
using System.Collections.Generic;
using System.Windows;
namespace RadioButtonMadness
{
public class Option
{
public String Key{ get; set; }
public Double Value { get; set; }
public Option(String key, Double value)
{
Key = key;
Value = value;
}
}
public class PrognosticFactor
{
private String title;
public List<Option> Options
{
get
{
var list = new List<Option>();
list.Add(new Option("One", 1));
list.Add(new Option("Two", 2));
list.Add(new Option("Three", 3));
return list;
}
}
public String Title
{
get { return title; }
}
public PrognosticFactor(String value)
{
title = value;
}
}
public class ViewModel
{
public List<PrognosticFactor> PrognosticFactors
{
get
{
var list = new List<PrognosticFactor>();
list.Add(new PrognosticFactor("Test1"));
list.Add(new PrognosticFactor("Test2"));
list.Add(new PrognosticFactor("Test3"));
return list;
}
}
}
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new ViewModel();
}
}
}

Just bind GroupName to the Title property. You can do it something like this:
<ItemsControl.ItemTemplate>
<DataTemplate>
<RadioButton Content="{Binding Key}" GroupName="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Grid}, Path=DataContext.Title}" />
</DataTemplate>
</ItemsControl.ItemTemplate>

Validating ItemsControl in wpf didn't work

I have an ItemsControl to display translations text fields.
I want to setup validating, so if all translations are empty, there was an error, and fields was marked as "error".
Is there any possibilty to do this?
My xaml:
<ItemsControl x:Name="LanguageItemsControl" ItemsSource="{Binding Path=Translations, Mode=TwoWay}"
LostFocus="OnLostFocus" >
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid Margin="5,2,5,2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="47*"/>
<ColumnDefinition Width="53*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" x:Name="ItemLabel" VerticalAlignment="Center"
Text="{Binding Path=Key, StringFormat={x:Static res:Resources.lblCaption}}" />
<TextBox Grid.Column="1" x:Name="ItemText" VerticalAlignment="Center"
HorizontalAlignment="Stretch" Margin="2,0,22,0"
Text="{Binding Path=Value, Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=true, NotifyOnValidationError=true}"
LostFocus="OnLostFocus"
AcceptsReturn="True"
MaxLines="2"
ScrollViewer.VerticalScrollBarVisibility="Auto"
MaxLength="150">
</TextBox>
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
My model's class implements from IDataErrorInfo and INotifyPropertyChanged
Translations is an ObservableCollection of custom type "LanguageValue" with public properties Key and Value.
I had in my model string this[string columnName], which works perfect with simple text boxes (outside ItemsControl), but how can make this works with my items? I've thight something like:
public string this[string columnName]
{
get
{
string result = null;
...
if (columnName == "Translations" || columnName == "ItemText")
{
if (Translations.All(t => string.IsNullOrEmpty(t.Value)))
result = Properties.Resources.errMsgEnterName;
}
...
But of course this didn't work.
Any suggestions?

Sure, I'm giving you a full implementation but with just the "Value" property. Do the same with all other properties that you want to validate:
1.Translation Model with IDataErrorInfo interface implementation:
public class Translation : BindableBase, IDataErrorInfo
{
public string Value { get; set; }
public string this[string propertyName]
{
get
{
return GetErrorForPropery(propertyName);
}
}
public string Error { get; }
private string GetErrorForPropery(string propertyName)
{
switch (propertyName)
{
case "Value":
if (string.IsNullOrEmpty(Value))
{
return "Please enter value";
}
return string.Empty;
default:
return string.Empty;
}
}
}
2.Initialize Translations in your ViewModel:
public ObservableCollection<Translation> Translations { get; set; }
public MainViewModel()
{
Translations = new ObservableCollection<Translation>
{
new Translation {Value = "A"},
new Translation (),
new Translation {Value = "C"}
};
}
3.Xaml with ValidatesOnDataErrors on the Value TextBox:
<ItemsControl x:Name="LanguageItemsControl" ItemsSource="{Binding Path=Translations, Mode=TwoWay}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid Margin="5,2,5,2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="47*"/>
<ColumnDefinition Width="53*"/>
</Grid.ColumnDefinitions>
<TextBox Grid.Column="0" x:Name="ItemLabel" VerticalAlignment="Center" Text="{Binding Path=Value, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" />
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
4.That will show a red box around the empty TextBox, if you want to display the error messeage when hovering overthe TextBox you need a tool tip:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:customControlLib="clr-namespace:CustomControlLib;assembly=CustomControlLib"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
mc:Ignorable="d"
Title="MainWindow"
DataContext="{StaticResource MainViewModel}">
<Window.Resources>
<Style x:Key="TextBoxStyle" TargetType="{x:Type TextBox}">
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="ToolTip"
Value="{Binding RelativeSource={RelativeSource Self},
Path=(Validation.Errors)[0].ErrorContent}"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<ItemsControl x:Name="LanguageItemsControl" ItemsSource="{Binding Path=Translations, Mode=TwoWay}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid Margin="5,2,5,2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="47*"/>
<ColumnDefinition Width="53*"/>
</Grid.ColumnDefinitions>
<TextBox Grid.Column="0" x:Name="ItemLabel" Style="{StaticResource TextBoxStyle}" VerticalAlignment="Center" Text="{Binding Path=Value, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged}" />
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>

WPF MVVM changing viewmodel calls dependency property on old viewmodel

I have a TabViewModel wich contains a dependency property CurrentViewModel. The CurrentViewModel property is bound to a ContentControl in the view TabView.xaml. The TabViewModel also contains a command to change the CurrentViewModel to a ProductViewModel:
public class TabViewModel: BaseViewModel
{
public string TabName { get; set; }
//public List<BaseViewModel> ViewModels { get; set; }
private PageViewModel _currentViewModel;
public PageViewModel CurrentViewModel
{
get { return _currentViewModel; }
set
{
_currentViewModel = value;
OnPropertyChanged("CurrentViewModel");
}
}
public TabViewModel(string tabName, PageViewModel currentViewModel)
{
TabName = tabName;
CurrentViewModel = currentViewModel;
}
private ICommand _navigateToProductViewModelCommand;
public ICommand NavigateToProductViewModelCommand
{
get
{
if (_navigateToProductViewModelCommand == null)
{
_navigateToProductViewModelCommand = new DelegateCommand<Product>(
(p) =>
{
CurrentViewModel = new ProductViewModel();
});
}
return _navigateToProductViewModelCommand;
}
}
}
TabView.xaml
<UserControl x:Class="Monitoring_Tool.Views.TabView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<ProgressBar Value="{Binding Path=CurrentViewModel.PageProgress}" Height="5" Grid.Row="0" Margin="0,0,0,10">
<ProgressBar.Style>
<Style TargetType="{x:Type ProgressBar}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ProgressBar">
<Border BorderThickness="0,0,0,0" Background="LightGray" CornerRadius="0" Padding="0">
<Grid x:Name="PART_Track">
<Rectangle x:Name="PART_Indicator" HorizontalAlignment="Left" Fill="#00B6FA" />
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ProgressBar.Style>
</ProgressBar>
<ContentControl Content="{Binding Path=CurrentViewModel}" Grid.Row="1" />
</Grid>
I instantiate the TabViewModel like this:
new TabViewModel("Producten", new ProductsViewModel())
The ProductsView.xaml is shown like it should be. In the ProductsView.xaml I call the command from the TabViewModel like this:
<DataGrid.InputBindings>
<MouseBinding
MouseAction="LeftDoubleClick"
Command="{Binding DataContext.NavigateToProductViewModelCommand, RelativeSource={RelativeSource AncestorType={x:Type views:TabView}}}"/>
</DataGrid.InputBindings>
When the datagrid is empty, the command is executed and ProductView.xaml appears like it should be. But when the datagrid is not empty somthing strange happens:
the command is executed, and when I debug I can see that the currentViewModel is changed to ProductViewModel. Then when OnPropertyChanged("CurrentViewModel") is called. There is a set call (value = null) to a depedency property (SelectedAssetCategory) on the ProductsViewModel, wich was replaced and doesn't exits anymore?!
When I put CurrentViewModel = null the same thing happens, I can only do CurrentViewModel = new ProductsViewModel. So I guess it's somthing with updating the UI?
In the App.xaml I defined the following recources:
<DataTemplate DataType="{x:Type viewmodels:TabViewModel}">
<views:TabView />
</DataTemplate>
<DataTemplate DataType="{x:Type viewmodels:ProductsViewModel}">
<views:ProductsView />
</DataTemplate>
<DataTemplate DataType="{x:Type viewmodels:ProductViewModel}">
<views:ProductView />
</DataTemplate>
The ProductsViewModel looks like this:
class ProductsViewModel: PageViewModel
{
private readonly MonitotingToolEntities _databaseEntities;
public ProductsViewModel()
{
_databaseEntities = new MonitotingToolEntities();
AssetCategories = new ObservableCollection<AssetCategory>(_databaseEntities.AssetCategory.ToList())
{
new AssetCategory() {AssetCategoryID = 0, AssetCategoryName = "Alles"}
};
Results = new ObservableCollection<Product>();
}
public ObservableCollection<AssetCategory> AssetCategories { get; set; }
private AssetCategory _selectedAssetCategory;
public AssetCategory SelectedAssetCategory
{
get { return _selectedAssetCategory; }
set
{
_selectedAssetCategory = value; //this one is called with value = null
OnPropertyChanged("SelectedAssetCategory");
Filter();
}
}
public ObservableCollection<Product> Results { get; set; }
public void Filter()
{
Results.Clear();
List<Product> products =
SelectedAssetCategory.AssetCategoryID == 0
? _databaseEntities.Product.ToList()
: SelectedAssetCategory.Product.ToList();
foreach (Product product in products)
{
Results.Add(product);
}
}
}
ProductsView.xaml:
<UserControl x:Class="Monitoring_Tool.Views.ProductsView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:views="clr-namespace:Monitoring_Tool.Views"
xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:viewModels="clr-namespace:Monitoring_Tool.ViewModels"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<UserControl.Resources>
<CollectionViewSource x:Key="CvsAssetCategories" Source="{Binding Path= AssetCategories}" >
<CollectionViewSource.SortDescriptions>
<componentModel:SortDescription PropertyName="AssetCategoryID"/>
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
<CollectionViewSource x:Key="CvsResults" Source="{Binding Path= Results}" >
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="AssetCategory.AssetCategoryName" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
<Style TargetType="Image" x:Key="ImageDisabledStyle">
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Opacity" Value="0.5" />
</Trigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="*" />
<RowDefinition Height="auto" />
</Grid.RowDefinitions>
<Grid Margin="0, 0, 0, 10" Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto"/>
<ColumnDefinition Width="2*"/>
<ColumnDefinition Width="3*"/>
<ColumnDefinition Width="auto"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="auto"/>
<ColumnDefinition Width="auto"/>
</Grid.ColumnDefinitions>
<TextBlock Text="Asset Categorie:" Grid.Column="0" VerticalAlignment="Center" Margin="0,0,10,0"/>
<ComboBox Grid.Column="1"
ItemsSource="{Binding Source={StaticResource CvsAssetCategories}}"
DisplayMemberPath="AssetCategoryName"
SelectedItem="{Binding SelectedAssetCategory}"
Margin="0,0,10,0"/>
<TextBlock Text="Zoeken:" Grid.Column="3" VerticalAlignment="Center" Margin="0,0,10,0"/>
<ComboBox Grid.Column="4"
SelectedItem="{Binding SelectedSearchField}"
Margin="0,0,10,0"/>
<TextBox Text="{Binding Path=SearchQuery, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
Grid.Column="5" Margin="0,0,10,0">
<TextBox.InputBindings>
<KeyBinding Command="{Binding Path=SearchCommand}" CommandParameter="{Binding SearchQuery}" Key="Enter" />
</TextBox.InputBindings>
</TextBox>
<Button Grid.Column="6"
Command="{Binding SearchCommand}"
CommandParameter="{Binding SearchQuery}"
Padding="5,0,5,0" Margin="0,0,10,0" >
<Button.Content>
<Image Source="/Recourses/SearchIcon.png"
Stretch="None" VerticalAlignment="Top" Style="{Binding Source={StaticResource ImageDisabledStyle}}"/>
</Button.Content>
</Button>
<Button Grid.Column="7"
Command="{Binding CancelSearchCommand}"
IsEnabled="{Binding CancelSearchEnabled}"
Padding="5,0,5,0">
<Button.Content>
<Image Source="/Recourses/CancelSearchIcon.png"
Stretch="None" VerticalAlignment="Top" Style="{Binding Source={StaticResource ImageDisabledStyle}}"/>
</Button.Content>
</Button>
</Grid>
<DataGrid Name="DgProducts" AutoGenerateColumns="False"
RowHeaderWidth="0" Margin="0,0,0,10" Grid.Row="1" IsReadOnly="True"
SelectionMode="Single" CanUserReorderColumns="False"
EnableRowVirtualization="True" VirtualizingPanel.IsVirtualizingWhenGrouping="True"
ItemsSource="{Binding Source={StaticResource CvsResults}}" SelectedItem="{Binding SelectedProduct}">
<DataGrid.CellStyle>
<Style TargetType="DataGridCell">
<Setter Property="BorderThickness" Value="0"/>
</Style>
</DataGrid.CellStyle>
<DataGrid.InputBindings>
<MouseBinding
MouseAction="LeftDoubleClick"
Command="{Binding DataContext.NavigateToProductViewModelCommand, RelativeSource={RelativeSource AncestorType={x:Type views:TabView}}}"
/>
</DataGrid.InputBindings>
<DataGrid.Resources>
<Style TargetType="DataGridColumnHeader" x:Key="DgVerticalColumnHeader">
<Setter Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="270" />
</Setter.Value>
</Setter>
</Style>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}"
Color="LightGray"/>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey }"
Color="Black"/>
</DataGrid.Resources>
<DataGrid.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="GroupItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="GroupItem">
<StackPanel>
<TextBlock Text="{Binding Path=Name}" Background="DarkGray" Padding="2,0,0,0"/>
<ItemsPresenter/>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</DataGrid.GroupStyle>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Path=Manager.ManagerName}" Header="Manager" />
<DataGridTextColumn Binding="{Binding Path=ProductName}" Header="Product" />
<DataGridTextColumn Binding="{Binding Path=MonitoringBy}" Header="Monitoring door" />
<DataGridTextColumn Binding="{Binding Path=AumProduct}" Header="AUM Product (mln)" />
<DataGridTextColumn Binding="{Binding Path=AumProductDate, StringFormat='{}{0:dd-MM-yyyy}'}" Header="Datum AUM Product" />
<DataGridTextColumn Binding="{Binding Path=AumStrategy}" Header="AUM Strategie (mln)" />
<DataGridTextColumn Binding="{Binding Path=AumStrategyDate, StringFormat='{}{0:dd-MM-yyyy}'}" Header="Datum AUM Strategie" />
<DataGridTextColumn Binding="{Binding Path=Aum}" Header="AUM (mln)" />
<DataGridTextColumn Binding="{Binding Path=TotalExpenseRatio}" Header="TER (bp)" />
<DataGridTextColumn Binding="{Binding Path=Fee}" Header="Total Fee" />
</DataGrid>
<Grid Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Path=Results.Count, StringFormat='{}{0} Producten'}" Grid.Column="0" Margin="0,0,0,0"/>
<Button Grid.Column="2"
Content="Toevoegen"
Padding="5,0,5,0" Margin="0,0,10,0"
Command="{Binding AddProductCommand}" />
<Button Grid.Column="3"
Content="Verwijderen"
Padding="5,0,5,0"
Command="{Binding Path=RemoveProductCommand}"
CommandParameter="{Binding Path=SelectedProduct}"/>
</Grid>
</Grid>
PageViewModel is an abstract class:
public abstract class PageViewModel: BaseViewModel
{
private int _pageProgress;
public int PageProgress
{
get { return _pageProgress; }
set
{
_pageProgress = value;
OnPropertyChanged("PageProgress");
}
}
}

It's kind of weird but it has something to do with the collectionviewsource (CvsAssetCategories) bound to the combobox. If I bind directly to the combobox without using the collectionviewsource the dependency property is not called. However, I like to use the collectionviewsource for the sortdescriptor. My solution now is a not null check on the setter from the dependency property, but I think its nasty way to go.