I'm programming in WPF(C#). I have a lot of controls in my Window. I normal situation, pressing TAB button causes to move focus from starting point(1) to next control (2) and then (3) and ... At the end of this scenario, I need to move focus from end point(17) to start point(1) as you see below:

How can I do it? I need some thing like this method:
MoveFocus(Control controlName)
{
// code...
}