Using ChangeDisplaySettings() ??

Hi,
    Been a while since I have asked a Q so here is what I hope to be a simple one.

I have an application that I use the ChangeDisplaySettings() function in. It works perfectly in that it resizes the screen to the correct default size that I require and also to the correct Bit format.

Now the problem is that the taskbar is sitting in no mans land. On reading the help the WM_DISPLAYCHANGE is supposed to be called automatically and this should in turn refresh the registry. So why if the computer is in 640x480x16bit mode and I want the default to be 800x600x16bit that after the application successfully changes the resolution that the task bar is sitting at the same co-ordinate position as if it were still in 640x480 mode. The same applies is I am in 1024x768 and I resize to 800x600 the taskbar becomes invisible and must not be able to be seen as it is outside the screens new area. A bit strange as when the app finishes it defers back to the default setting and everything is okay.

Why won't it resize the taskbar to suit the mode I am in ??  I am using Win98 second edition and also have the same problem on Win NT.

Also it will magically appear in the right position if you hit the windows button on the keyboard. Obviously it must be a refresh problem but what function should I use since ChangeDisplaySettings should do it automatically ?