Pop up on a subpanel control. There's an option for "Make Panel Transparent". When you enable that, the background of the panel is transparent and you can see controls/indicators underneath. The key word here is "see". You cannot click on those controls. The subpanel eats the mouse clicks. I talked about this with a couple people and could come up with no use case where you would want a transparent subpanel and not be able to click on the controls behind it. What I think the behavior should be is "if the mouse click hits a control in the subpanel, that control gets the click. If no control in the subpanel gets the click, the click falls through to the controls behind it, if any."
