Text message in a window on the fly

In C#, if I select a menu item in a window (Radio Button), and press Select, it takes a short while before the next window pops up. How do I display in the menu window a 'Please Wait' message? I'm using WPF as my interface with C# as my underlying code. I tried putting a TextBlock in the XAML code, with "" as the Text Property. Then, when the Click_Select routine is called, changing the Text to 'Please Wait'. Doesn't work until the next window pops up. How do I redisplay the window to display immediately the message or is there a way to just display the message?

Sutton

try "System.Windows.Forms.Application.DoEvents();"

add a reference to System.Windows.Forms