Question

Is it possible to have multiple ItemSources for a single control?

Given the code below:

<ComboBox Margin="137,101,169,183" ItemsSource="{Binding collection}"   SnapsToDevicePixels="True"            
 <ComboBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                <CheckBox Command="{Binding CheckCommand}" IsChecked="{Binding IsChecked}" Content="{Binding Name}"/>
                    <TextBlock Text="" />
                </StackPanel>
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>

The TextBlock within the ComboBox DataTemplate requires data from another property within the VM than that of the ComboBox. How can this be achieved?

Thanks.

Answer 1

You can use RelativeSource-FindAncestor to reach up the visual tree and grab a different DataContext.

For example (assuming the command is what you want):

Command=”{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ComboBox}}, Path=CheckCommand}”

This should also serve as a good resource.

Edit: Typo and resources.