Can't set focus to a child of UserControl

Question

I have a UserControl which contains a TextBox. When my main window loads I want to set the focus to this textbox so I added Focusable=\"True

Answer 1

I had same problem with setting keyboard focus to canvas in WPF user control. My solution

1. In XAML set element to Focusable="True"

2. In element_mousemove event create simple check:

   if(!element.IsKeyBoardFocused)
       element.Focus();
   

In my case it works fine.