In WPF, How do I link a button to an item in a datatemplate

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WPF

DataTemplate

Hi !

I'm using a DataTemplateSelector to allow users to edit several items in my software. All these items can be of several types.

My DataTemplates mainly consist of a viewer (TextBox, Image,...) and some buttons dealing actions on the DataContext. I access to it using code like this :

var DataItem = ((FrameworkElement)sender).DataContext as MyItemType;

It works very well for the vast majority of my items, but I've problem with the RichTextBox case : some of my buttons have to access data, not in the DataContext, but in the RichTextBox.Selection

My code looks like that :

<DataTemplate x:Key ="TexteTemplate">
        <Border>
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition/>
                    <RowDefinition/>
                </Grid.RowDefinitions>
                <StackPanel Grid.Row="0" Orientation="Horizontal" HorizontalAlignment="Right">
                    <Button  Content="G" TextElement.FontWeight="Bold" Click="RichTextGras_Click" />
                    <Button Content="I" TextElement.FontStyle="Italic" Click="RichTextItalic_Click" />
                    <Button Content="S" Click="RichTextSouligné_Click" />
                </StackPanel>
                <RichTextBox Grid.Row="1" Document="{Binding Path=Text}" x:Name ="RTBox"/>
            </Grid>
        </Border>
    </DataTemplate>

(only the essential was kept)

Thanks for your help !