Overlaying one grid over another

[mwalter]

I'm trying to mimic a drill down page using PUI. I have a main grid with control that when clicked, will show another grid below the row selected. This works fine, however, I can still see the image of the main grid along with the "sub" grid.

I'm using the visible property to show the "sub" grid. I don't want to execute another format, because I still want to interact with the "main" grid to close the "sub" grid. There are also some functions of the "sub" grid to which I may need to react.

I've tried using both a layout and a CSS Panel Layout under the "sub" grid. I've messed with the Opacity CSS property of the "sub" grid layout. Still no joy.

Any suggestions?