Question

I have the following .xaml:

<TreeView ItemsSource="{Binding EntityInstanceGroupings}">
    <TreeView.ItemTemplate>
        <DataTemplate>
            <TreeViewItem ItemsSource="{Binding EntityInstances}">
                <TreeViewItem.HeaderTemplate>
                    <DataTemplate>
                        <DockPanel LastChildFill="True">
                            <TextBlock Text="{Binding ...}" />
                            <Button Content="Add" DockPanel.Dock="Right" VerticalContentAlignment="Top">
                                ...
                            </Button>
                        </DockPanel>
                    </DataTemplate>
                </TreeViewItem.HeaderTemplate>
                <TreeViewItem.ItemTemplate>
                    ...
                </TreeViewItem.ItemTemplate>
            </TreeViewItem>
        </DataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

At the line:

<TextBlock Text="{Binding ...}" />

I’m trying to bind to a property “GroupName” that is in the EntityInstanceGroupings view model. I can’t figure out to do this (if it is even possible). Any help would be greatly appreciated 🙂

Answer 1

You should be able to achieve this using RelativeSource.

<TextBlock Text="{Binding RelativeSource={RelativeSource AncestorType=TreeViewItem},
    Path=DataContext.GroupName}" />