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WPF bind to property of the ItemsPanel of an ItemsControl

I've written a code example below:
<StackPanel>
<TextBlock>Appointments today</TextBlock>
<ItemsControl ItemsSource="{Binding Appointments}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<controls:CalendarMonthDayEventsItemsPanel OutsideViewportCount="..." />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Border>
<TextBlock Text="{Binding Title}" />
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
<StackPanel Orientation="Horizontal">
<TextBlock>+</TextBlock>
<TextBlock Text="{Binding ......}" /> <!-- Should show number of items in ItemsControl that are outside view, using CalendarMonthDayEventsItemsPanel.OutsideViewportCount -->
<TextBlock>more items</TextBlock>
</StackPanel>
</StackPanel>
I Created a custom Panel, the CalendarMonthDayEventsItemsPanel, and I use that panel as the itemspanel of the ItemsControl. In the panel's layout code, I determine how many items (panel childs) are outside the bounds of the panel. The property OutsideViewportCount contains the number of items that are outside of the visible bounds of the CalendarMonthDayEventsItemsPanel.
Now I want to show the value of OutsideViewportCount in a TextBlock that's below the ItemsControl.
This means I have to create some kind of binding, but everything I tried doesn't work.
Does someone have a solution or a better approach to achieve the same result?

Maybe you can make use of Tag property of ItemsPanel to relay the value of ItemsPanel as a workaround.
<ItemsControl x:Name="A"
ItemsSource="{Binding Appointments}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<local:CalendarMonthDayEventsItemsPanel OutsideViewportCount="{Binding RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}, Path=Tag, Mode=OneWayToSource}"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
...
</ItemsControl>
<StackPanel Orientation="Horizontal">
<TextBlock>+</TextBlock>
<TextBlock Text="{Binding ElementName=A, Path=Tag, Mode=OneWay}"/>
<TextBlock>more items</TextBlock>
</StackPanel>

ContentControl.Content not binding correctly in MVVM

I have an MVVM app. I want a collection of buttons to be represented from the ViewModel and be dynamic.
Which means I want to populate the window with controls from the ViewModel.
I tried creating a content control and binding it's Content property to a Grid which I will put buttons in. The binding did not work, it remains empty.
I tried binding it to a simple string, still nothing. I should mention that other simple bindings do work, so that's why it's weird.
The creation of the UserControl:
<TabControl HorizontalAlignment="Left" Height="696" Margin="429,0,0,32" VerticalAlignment="Bottom" Width="552" ItemsSource="{Binding TabCollection}">
<TabControl.Resources>
</TabControl.Resources>
<TabControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Header}"/>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<cattab:CategoryTab/>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>`
The binding in the UserControl:
<ContentControl HorizontalAlignment="Left" Height="286" Margin="98,152,0,-396" VerticalAlignment="Top" Width="313">
<ContentControl Content="{Binding Favorites}" Margin="0,30,0,0" VerticalAlignment="Top"/>
</ContentControl>`
MainViewModel:
//**** Initilize TabCollection with fake data (temporary)
TabCollection.Add(new CategoryTabViewModel { Header = "בדיקה11" });
TabCollection.Add(new CategoryTabViewModel { Header = "בדיקה2" });
UserControl ViewModel:
public CategoryTabViewModel()
{
SearchText = "bbbaaaa";
Favorites.Add(new Button());
}
The binding of SearchText works, on Favorites it's not

Try to use an ItemsControl
Here's a good tutorial: http://www.wpf-tutorial.com/list-controls/itemscontrol/
<ItemsControl HorizontalAlignment="Left" Height="286" Margin="98,152,0,-396" VerticalAlignment="Top" Width="313" Content="{Binding Favorites}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<controlsToolkit:WrapPanel Orientation="Horizontal"/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Button Content="{Binding Name}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
Use a WrapPanel to manage your layout: http://www.wpftutorial.net/WrapPanel.html

After reading your updates I can say that your code is not MVVM compliant because your ViewModel layer is aware of the View layer (you create Buttons in your ViewModel)
What you need to do:
XAML of your CategoryTab
<ItemsControl ItemsSource="{Binding Favorites, Mode=OneWay}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Button/><!--Show whatever you want here-->
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
If you want to create new Button every time an object is added to Favorites you will need to make Favorites an ObservableCollection.

Listview in WinRT using C#

I want my ListView to display the items in a group horizontally as displayed in the image below. I could not find anything relating to this online. This screen was taken from the Groove music application. Since I am new to asking questions here it seems I don't have enough reputation to post images therefore I provided a link to the image in question sorry for the inconvenience.
http://i.imgur.com/boCK9iy.png
Edit:
I am trying to imitate the groove music player for a school project this link below shows my app. Hopefully this give you a better idea of the problem.
http://i.imgur.com/vPJ13Sc.png
My Xaml Code:
<ListView
x:Name="itemGridView"
Grid.Row="1"
ItemsSource="{Binding Source={StaticResource artistsItemsViewSource}}"
SelectionMode="None"
IsSwipeEnabled="false"
IsItemClickEnabled="True"
RequestedTheme="Light">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel MaxWidth="200">
<Ellipse Height="150" Width="150">
<Ellipse.Fill>
<ImageBrush Stretch="Fill" ImageSource="Assets/Artist.png"/>
</Ellipse.Fill>
</Ellipse>
<TextBlock Text="{Binding ArtistName}" FontSize="18" HorizontalAlignment="Center" Margin="0,5,0,0" TextWrapping="Wrap"/>
<TextBlock Text="{Binding AlbumCount}" FontSize="15" HorizontalAlignment="Center" Margin="0"/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<ItemsStackPanel Width="200" HorizontalAlignment="Left" Margin="30,0,0,0"/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<Grid Margin="0,0,0,2">
<TextBlock Text="{Binding AlphaLetter}" FontSize="20" Foreground="{StaticResource SideButtonBlue}" />
</Grid>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>

I think you can change the view in the listview settings to LargeIcon and then you can set Icons for each value in your listview.
But you could maybe use the ObjectListView its better than the plain ListView and you have more functions. check this out: click
I found something similar on the site of the objectlistview: here

for horizontal placement of the elements in ListView do this:
<ItemsStackPanel
Orientation="Horizontal" />
also, remove Width="200"
also you can use GridView instead of ListView

Trying to get a Windows Phone 8 ListPicker to work

The ListPicker functions, in that I can click on it and a full screen popup appears, but there are options to choose from.
My xaml:
<toolkit:ListPicker ExpansionMode="FullScreenOnly" FullModeHeader="Select Module" Name="modulePicker">
<toolkit:ListPicker.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding moduleNumber}"/>
</StackPanel>
</DataTemplate>
</toolkit:ListPicker.ItemTemplate>
<toolkit:ListPicker.FullModeItemTemplate>
<DataTemplate>
<StackPanel">
<TextBlock Text="{Binding moduleNumber}"/>
</StackPanel>
</DataTemplate>
</toolkit:ListPicker.FullModeItemTemplate>
</toolkit:ListPicker>
And the C# behind it includes:
String[] moduleNumber = { "AA1", "AA2", "AA3" };
and
public MainPage()
{
InitializeComponent();
this.modulePicker.ItemsSource = moduleNumber;
}
So what do I need to do to get the strings listed in moduleNumber to display on the ListPicker?
If you need to know more just ask.

The code behind is fine. This is a xaml issue. Try this approach instead in your xaml file.
1) Define your data templates as PhoneApplicationPage Resources which bind to the moduleNumber array from the code behind.
2) Then bind your list picker to the templates.
<phone:PhoneApplicationPage.Resources>
<DataTemplate x:Name="modulePickerItemTemplate">
<StackPanel>
<TextBlock Text="{Binding moduleNumber}"/>
</StackPanel>
</DataTemplate>
<DataTemplate x:Name="modulePickerFullItemTemplate">
<StackPanel>
<TextBlock Text="{Binding moduleNumber}"/>
</StackPanel>
</DataTemplate>
</phone:PhoneApplicationPage.Resources>
<toolkit:ListPicker ExpansionMode="FullScreenOnly" FullModeHeader="Select Module"
Name="modulePicker"
FullModeItemTemplate="{Binding modulePickerFullItemTemplate}"
ItemTemplate="{Binding modulePickerItemTemplate}" />

I think your original code didn't work was because of a typo -

WPF how to bind a tabitem with a list

I have the following problem:
i have some data loaded in my application, that need to be put in a tab control.
The data is in the format:
class objectType1
{
string property_1;
string prorerty_2;
}
class mainObject
{
string mainProperty_1;
string mainProperty_2;
List<objectType1> objectsList;
}
and all the data is loaded in an object of type
List<mainObject> myListofObjects
So far i managed to create the tabitems with respect to myListofObjects item
(ie if the list has 5 objects, 5 tabs are created with the header containing the information mainProperty_1 and mainProperty_2)
now i need to add the data contained in each objectsList into their respective tab...
the mainProperty_1 represents an image, which must be loaded...
<TabControl x:Name="_DataList" Margin="10">
<!-- Header -->
<TabControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Height="18" Source="{Binding mainProperty_1/>
<TextBlock Text="{Binding mainProperty_2}" Margin="2,0,0,0" />
</StackPanel>
</DataTemplate>
</TabControl.ItemTemplate>
<!-- Content -->
<TabControl.ContentTemplate>
<DataTemplate x:Name="objectDataTemplate">
<Grid Margin="5">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding property_1}" ToolTip="{Binding property_2}" IsHitTestVisible="false" Stretch="Uniform"/>
</StackPanel>
</Grid>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
I pass the data to the tabcontrol in code behind with
_DataList.ItemsSource = myListofObjects;
this is not working for the content...
the header loads just fine (both image and the text...)
anyone has any idea how to do it?
Thanks a lot!

your ContentTemplate seems to be wrong:
<TabControl x:Name="_DataList" Margin="10">
<!-- Header -->
<TabControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Height="18" Source="{Binding mainProperty_1/>
<TextBlock Text="{Binding mainProperty_2}" Margin="2,0,0,0" />
</StackPanel>
</DataTemplate>
</TabControl.ItemTemplate>
<!-- Content -->
<TabControl.ContentTemplate><!-- its bound to one mainObject -->
<DataTemplate x:Name="objectDataTemplate">
<!-- if you wanna bind to something from your objectsList you have to threat it like a list, cause it is :) -->
<ListBox Itemssource={Binding objectsList}>
<ListBox.ItemTemplate>
<DataTemplate DataType="{x:Type objectType1}">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding property_1}" ToolTip="{Binding property_2}" IsHitTestVisible="false" Stretch="Uniform"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>

1) Have you tried to connect to list via binding?
var b = new Binding("myListofObjects");
BindingOperations.SetBinding(_DataList, ItemsControl.ItemsSourceProperty, b);
2) If you're using binding, have you set appropriate DataContext?