I wouldn't think it has anything to do with the title bar.  It is is a
matter of the form being active or having the focus.

Hi John,

When a window in a WPF Windows application is activated, the Activated
event of the window is raised. On the contrary, when the window is
deactivated, the Deactivated event of the window is fired.

The following is a sampe of handling the Activated and Deactivated event of
a window.

public partial class Window1 : System.Windows.Window
{
       public Window1()
       {
            InitializeComponent();
            this.Activated += new EventHandler(Window1_Activated);
            this.Deactivated += new EventHandler(Window1_Deactivated);
        }
         void Window1_Deactivated(object sender, EventArgs e)
       {
           Console.WriteLine("deactivated");
       }

       void Window1_Activated(object sender, EventArgs e)
       {
           Console.WriteLine("activated");
       }
}

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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