How to set focus to a control in a TreeViewItem when selected

Question

I have a TreeView in which the items are defined by HierarchicalDataTemplates. Each TreeViewItem that is created has some TextBoxes in it. When a TreeViewItem is selected I want to set the Keyboard Focus to a TextBox of the TreeViewItem (the TextBoxhas the name TextBox1). How can I do this?

Answer 1

There are many ways you can do this. Here is just one of them. Use mine FocusExtension. IsFocused attached property. Bind it to TreeViewItem.IsSelectedProperty if you don't have a ViewModel underneath. Something like

<TextBox local:FocusExtension.IsFocused="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TreeViewItem}}}" />

should work. I typed that from head and didn't check the syntax. Be careful while copy-pasting :).