Instable focus of WPF apps

Question

If I have problems with WPF, then it always concerns the Focus-Management. There are cases, my App loses totally focus so that another application gains the focus an

Answer 1

For losing focus for the entire app make sure you set the Owner property on all windows before you show them.

For losing focus inside the app, usually this happens when some control you didn't think off is getting but not showing anything (for example some random StackPanel or Grid used for layout), you have to hunt those down and add Focusable="false"