disable maximize capacity in a wpf window

Question

I'm trying to disable the maximize capacity (not the maximize button) in a wpf window, but so far nothing has succeded.

I'm using a window with WindowStyle="none", but when I drag the window to the far top of the screen, the OS "maximizes" the window (terribly bad, by the way).

I uploaded 3 pictures to show what is happening exactly.

(however, due to the fact that I don't have 10 reputation, I have to post the links instead. Sorry about that. And I can't put all 3 links, only 2 of them, but the first one is just of the window working normally)

During:

After:

Answer 1

use the window state change event:

private void Window_StateChanged(object sender, EventArgs e)
{
    if (this.WindowState == System.Windows.WindowState.Maximized) 
    {
        this.WindowState = System.Windows.WindowState.Normal; 
    }
}