Flickering Pictures

I have two images loaded in two Image controls. The images are static and act as buttons to open two secondary windows in my application.

The images flicker badly both when the application starts and when returning from a secondary window to the main window (I hide the main window when it is not in use).

I have read all about using BitBlt to smoothly animate images but that is a lot of information that does not apply. What I need is to filter down all that to get just the basics.

How do I draw the pictures when the application loads and redraw it as necessary to get the least flicker. The animation examples I have seen are flicker free but they do flicker badly when the application loads so I don't think they have addressed the startup issue.

Thanks