In a RadTreeview I want to display an optional Textbox in each item.
I used a HierarchicalDataTemplate attached to the RadTreeview.
Now the width of the TextBox is equal to the width of the (header)text shown in the TextBlock.
I want to stretch the width of the TextBox to fill up the width of the whole item in the Treeview.
HorizontalAlignment= "Stretch" in the HierarchicalDataTemplate does not work.
Has anyone an idea to fix this?