Calling Focus on textbox in window 'x' causes the window 'x ' to be top most

Question

I have an application that takes user input, validates it, and either shows an error screen or continues to the next page.

When an error is thrown it calls a static method and passes a resource key for the error message. This static method launches a new window which is top most.

The issue is that this error window runs in it's own thread. In the main window where the user had input, I call focus on a textbox. This is so when the user starts typing again, it actually types in the text box. When I call focus on the text box though, it also places the error window behind the Main window.

How can I Focus on the textbox without stealing topmost from the error window?

Answer 1

I believe that this is the normal focus behaviour. If you were to manually click in the TextBox to focus it, that window would become the focused window. There are a few things that you could try to get around this.

Have you tried setting ErrorWindow.TopMost = true and MainWindow.TopMost = false?

You could try displaying the errors in the first window instead... the users would probably prefer this too.