I can't find any info on this and I know I've learned this once.
If I place 2 or more controls on top of each other a red box appears around them. What's that mean? Does it just mean they share the same dimensions? Obviously if they are all visible and enabled then the top one in the stack hides the others.
Is there a way to control the enabling and visibility of this "stack" of controls so that only one is visible based on some condition?