WPF - Access the parent Control from inside a Style Setter ControlTemplate

When making controls non-amendable we display them as a TextBox to keep a consistent style. The problem is that a ComboBox can have any type of data so binding the Text property of the ControlTemplate TextBox is not as simple as using SelectedItem.

<Style TargetType="{x:Type ComboBox}">
        <Style.Triggers>
            <Trigger Property="IsReadOnly" Value="True">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate>
                            <TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}, Path=????, Converter={StaticResource ResourceKey=ComboToTextConverter}, UpdateSourceTrigger=PropertyChanged}" />
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Trigger>
        </Style.Trigg开发者_运维百科ers>
    </Style>

The idea I have is to use a Converter and send the whole ComboBox so it can be handled by the Converter code. Is there anyway to do this?

Any other suggestions are welcome!

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you need to use the SelectedValue and SelectedValuePath properties:

<Style TargetType="ComboBox" x:Key="cStyle">
<Style.Triggers>
  <Trigger Property="IsReadOnly" Value="True">
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="ComboBox">
          <TextBox Text="{Binding RelativeSource=
                   {RelativeSource TemplatedParent}, 
                   Path=SelectedValue}" />
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Trigger>
</Style.Triggers>

and heres your ComboBox

<ComboBox Name="cbox" ItemsSource="{Binding}" 
        Style="{StaticResource cStyle}" 
        SelectedValuePath="SomeText" 
        DisplayMemberPath="SomeText" />

now when you set the IsReadOnly property to true on the ComboBox, it turns into a TextBox with the selected value as its text.