I am using an MVVM approach, and I have an object from my ViewModel called DatabasesSubFrame which is DataTemplated to show a ListBox. I want to display a Button below the ListBox, which binds to both the currently SelectedItem, and a property on the DatabasesSubFrame object which is being DataTemplated.
I know how to refer to the currently selected item, by setting the DataContext on a shared ancestor with the ListBox and use {Binding /}. In this example the shared ancestor is a StackPanel. And if the DataContext wasn't explicitly set there I could easily bind to a property on the DatabasesSubFrame object by just doing {Binding SomeProperty}. However, if I do {Binding SomeProperty} within the explicitly set DataContext, it refers to the wrong DataContext.
How do I access the "original" DataContext here? I tried messing with RelativeSources and TemplatedParents but couldn't figure out how to fit them in.
<DataTemplate DataType="{x:Type VM:DatabasesSubFrame}"> <StackPanel DataContext="{Binding Databases}" > <ListBox Name="DbInfoBox" ItemsSource="{Binding}" IsSynchronizedWithCurrentItem="True"> <ListBox.ItemTemplate> <DataTemplate> <Label Content="{Binding ShortName}"/> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <!-- Problem: The Command and V:CreateCommandBinding.Command are set incorrectly here. How do I access OpenDbCommand from the top-level DataTemplate's DataContext? --> <Button Content="Open Database" CommandParameter="{Binding /}" Command="{Binding ???, Path=OpenDbCommand.Command}" V:CreateCommandBinding.Command="{Binding ???, Path=DataContext.OpenDbCommand}"/> </StackPanel> </DataTemplate> 
