WPF XMAL trigger from button to change combo box item color.

Hi,

I have combo box and button in my project(WPF application)

In following example I have change color of button when "ButtonName" press and other example I have change color of "Item3 and Item4" when selected.

Any idea how to change Background color of "Item3 and Item4" in combo box when "ButtonName" is press.?

[1]. Example 1

<Button Width="73" Height="23" Content="ButtonName" Grid.Row="1" Grid.Column="1" Margin="104,202,180,45">
<Button.Template>
<ControlTemplate TargetType="{x:Type Button}">
<Border x:Name="button3" CornerRadius="2" BorderThickness="1">
<ContentPresenter Margin="4" VerticalAlignment="Top" HorizontalAlignment="Right"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="button3" Property="Background" Value="Pink"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>
</Button>

[2]. Example 2

<ComboBox TabIndex="1" x:Name="txtTitle" Margin="253,40,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Width="120" Height="23" SelectionChanged="txtTitle_SelectionChanged" Grid.ColumnSpan="2">
<ComboBoxItem Content="Item1" />
<ComboBoxItem Content="Item2" />
<ComboBoxItem Content="Item3" />
<ComboBoxItem Content="Item4" />
<ComboBoxItem Content="Item5" />

<ComboBox.Style>
<Style TargetType="ComboBox">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=SelectedItem.Content, ElementName=txtTitle}" Value="Item3">
<Setter Property="Background" Value="Pink"/>
</DataTrigger>
<DataTrigger Binding="{Binding Path=SelectedItem.Content, ElementName=txtTitle}" Value="Item4">
<Setter Property="Background" Value="Yellow"/>
</DataTrigger>
</Style.Triggers>
</Style>
</ComboBox.Style>
</ComboBox>

- Thanks
Zohaib