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Trying to override textbox for combobox styling (System.windows.markup.staticresourceholder exception)

I'm new in WPF and acccording to my previous question How to make selecteditem text red and bold on trigger (in combobox) I still have a problem with making my selecteditem (but not all combobox items) text red and bold in case when its IsNotCorrect property is true. If be more concrete I have system.windows.markup.staticresourceholder exception (it seems that all converters are declared, not sure of my new style declaring and the right order for it). These are the steps I have made:
create style to override textbox for my combobox at the beginning of my xaml file:
<Style x:Key="UserDefinedStyle" TargetType="{x:Type ComboBox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBox}">
<TextBox x:Name="PART_EditableTextBox"
Template="{StaticResource ComboBoxTextBox}"
HorizontalAlignment="Left"
VerticalAlignment="Bottom"
Margin="3,3,23,3"
Focusable="True"
Background="Transparent"
Visibility="Hidden"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
try to apply this style on my combobox (this part is inside of another style.
<Border BorderBrush ="{Binding SelectedReason.IsNotCorrect, Converter={StaticResource DisablingBoolToColorConverter}}" BorderThickness="2">
<ComboBox x:Name="REASON_ID" DisplayMemberPath="Name" IsReadOnly="True" IsEditable="True" SelectedItem="{Binding SelectedReason, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" Style"{DynamicResource UserDefinedStyle}">
<ComboBox.ItemsSource>
<CompositeCollection>
<ComboBoxItem Content="{DynamicResource lang_Common_SelectItem}" IsEnabled="False"/>
<CollectionContainer Collection="{Binding Source={StaticResource StaticReasons}}"/>
<TextBox x:Name="Part_EditableTextBox">
<TextBox.Style>
<Style TargetType="{x:Type TextBox}" BasedOn="{x:Null}">
<Style.Triggers>
<DataTrigger Binding="{Binding SelectedItem.IsNotCorrect, RelativeSource={RelativeSource AncestorType=ComboBox}}" Value="True">
<Setter Property="Foreground" Value="Red" />
<Setter Property="FontWeight" Value="Bold" />
</DataTrigger>
</Style.Triggers>
</Style>
<TextBox.Style>
</TextBox>
</CompositeCollection>
</ComboBox.ItemsSource>
</ComboBox>
</Border>

How do I change a controls background on my UserControl when the item is selected

So I have this ListView which has a DataTemplate of my UserContol because I wanted a custom design for my ListView and it looks like this
<ListView x:Name="LeftMenuListView"
ItemsSource="{Binding MenuItems}"
SelectedItem="{Binding SelectedMenuItem}"
BorderThickness="0"
Width="255">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<local:MenuItemControl/>
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Super simple, now when an Item is selected the entire thing changes color
which I want it looks great imo
<Style TargetType="ListViewItem">
<Setter Property="FocusVisualStyle" Value="{x:Null}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Border
Name="Border"
BorderThickness="0">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter TargetName="Border" Property="Background"
Value="#444444"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
But there is a border inside my usercontrol thats 10px wide with the name SmallBorder.
I want to change the color of that to green when the item is selected but I have no idea how to access that property
My UserControl
<Grid Background="Transparent">
<TextBlock Text="{Binding Name}"
VerticalAlignment="Center"
Margin="20,0,0,0"
Foreground="#9e9e9e"
FontFamily="Tahoma"/>
<Border Width="10"
HorizontalAlignment="Left"
x:Name="SmallBorder"/>
</Grid>
So how do I change the color of SmallBorder when an item is selected and then when it's not selected it turns transparent?

The ViewModel, which is the DataContext of you usercontrol, should expose a property like IsSelected, then you can add an style with a DataTrigger that reacts to a change in this property.
EDIT:
Declare an style for the border itself an access it as an StaticResource:
It could be placed in a ResourceDictionary, within YourUserControl.Resources or inline with the Border control declaration:
<Style TargetType={x:Type Border} x:Key=SelectedBorderStyle>
<Style.Triggers>
<DataTrigger Binding="{Binding IsSelected}" Value="True">
<Setter Property="BorderBrush" Value="Green" />
</DataTrigger>
</Style.Triggers>
</Style>
And then your UserControl would be:
<Grid Background="Transparent">
<TextBlock Text="{Binding Name}"
VerticalAlignment="Center"
Margin="20,0,0,0"
Foreground="#9e9e9e"
FontFamily="Tahoma"/>
<Border Width="10"
Style={StaticResource SelectedBorderStyle}
HorizontalAlignment="Left"/>
</Grid>
Note that now you don't need to set the name for the Border.

A Border is invisible unless there is something in it, but you could replace the Border with a Grid and use a Style with a DataTrigger that binds to the IsSelected property:
<Grid Background="Transparent">
<TextBlock Text="{Binding Name}"
VerticalAlignment="Center"
Margin="20,0,0,0"
Foreground="#9e9e9e"
FontFamily="Tahoma"/>
<Grid Width="10"
HorizontalAlignment="Left"
x:Name="SmallBorder">
<Grid.Style>
<Style TargetType="Grid">
<Style.Triggers>
<DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource AncestorType=ListViewItem}}" Value="True">
<Setter Property="Background" Value="Red" />
</DataTrigger>
</Style.Triggers>
</Style>
</Grid.Style>
</Grid>
</Grid>

Change the colour of the particular element in Treeview WPF

I have a Treeview in my WPF application. On the fly, in run time, If the element of the Tree meets certain condition, It should change its Font color from Black To Red.!
XAML
<TreeView Grid.Column="0" Grid.Row="0" HorizontalAlignment="Stretch" Name="treeView1"
VerticalAlignment="Stretch"
SelectedItemChanged="treeView1_SelectedItemChanged" HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Top" BorderThickness="0,0,0,1" BorderBrush="LightGray">
<TreeViewItem Header="Head Tree" ItemsSource="{Binding MainComps}">
<TreeViewItem.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
<DataTrigger Binding="{Binding IsSelected}" Value="True">
<Setter Property="Foreground" Value="RED" />
</DataTrigger>
</Style.Triggers>
</Style>
</TreeViewItem.ItemContainerStyle>
<TreeViewItem.Resources>
<HierarchicalDataTemplate DataType="{x:Type TextBlock}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="Head Tree" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type local:MainCompViewModel}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Maincompname}" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type local:FeatureViewModel}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding FeatureName}" />
</StackPanel>
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type local:CompViewModel}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Component}" />
</StackPanel>
</DataTemplate>
</TreeViewItem.Resources>
</TreeViewItem>
</TreeView>
Code behind
private void treeView1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
if(selected Item meets certain condition)
{
//Change color of tree node
}
}
How can I change the color of particular Node and leave it in the same color SO that when expanded again It should be in RED.
Any help would be appreciated.

You could create a boolean property in the model which is true when the elements meets the condition. Then you bind the Foreground like so:
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=BoolProp}" Value="False">
<Setter Property="Foreground" Value="Blue"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=BoolProp}" Value="True">
<Setter Property="Foreground" Value="Red"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
or with converter:
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="Foreground" Value="{Binding Path=BoolProp, Converter={StaticResource ResourceKey=TheKey}}"/>
</Style>
</TreeView.ItemContainerStyle>

Just change the Foreground:
TreeViewItem ti = (TreeViewItem)treeView1.SelectedItem;
ti.Foreground = Brushes.Red;

That is embedded into the template. You can only change the color by copying the default Aero-Style for the control and changing the hard-coded value.
Or by drilling down the visual tree on-load to change it that way.
To get the default style & tenmplate go through this MSDN
Can also check step wise EXAMPLE from here.

IsMouseOver event defined in a style is not triggered

This is defined in App.xaml inside <Application.Resources> :
<Style x:Key="borderStyle" TargetType="Border">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="Red" />
</Trigger>
</Style.Triggers>
</Style>
And I am using it here inside Window1.xaml :
<ListBox Name="listView1" ItemsSource="{Binding}" Background="Black" >
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Width="{Binding (FrameworkElement.ActualWidth), RelativeSource={RelativeSource AncestorType=ScrollContentPresenter}}" Orientation="Horizontal" ItemWidth="150" ItemHeight="150" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<Border BorderThickness="5" BorderBrush="DarkGray" Style="{StaticResource borderStyle}">
<Image Width="120" Height="120" Stretch="Fill" Source="{Binding Image}" />
</Border>
<TextBlock FontFamily="Verdana" Foreground="Orange" Text="{Binding Title}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
But it doesn't work, when I mouse over it, the border doesn't change the color.
What am I doing wrong ?
Thanks.

You are overriding the trigger if you define the property directly within the border.
Remove BorderBrush="DarkGray"from this line
<Border BorderThickness="5" BorderBrush="DarkGray" Style="{StaticResource borderStyle}">
so it looks like this
<Border BorderThickness="5" Style="{StaticResource borderStyle}">
and add a setter to your style
<Style x:Key="borderStyle" TargetType="Border">
<Setter Property="BorderBrush" Value="DarkGray" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="Red" />
</Trigger>
</Style.Triggers>
</Style>
As a thumb rule: all properties which should be modified by triggers have to be defined as setters within the style.

UserControl databinding with a treeview

I have a UserControl which contains a TreeView and a TextBlock:
<TreeView ItemsSource="{Binding FirstGeneration}" AllowDrop="True" Drop="TreeView_Drop" Width="300">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Normal" />
</Trigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal" >
<Image Source="{Binding Path=Image}" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
<TextBlock Height="23" Name="textBlock1" Text="{Binding= ???}" Width="187" />
When I select an item of the treeview, I want do show some informations contained in the item (eg : the name of the selected item).
My problem is that I don't know how doing this binding, because when I select an item, the setter IsSelected of the item class is called.
Have you a best practice for doing that ?

Have a look at this in MSDN. And also the BindableSelectedItemBehaviour here.