JInternalFrame, auto activate when mouse enters the frame

Hi, is there a simple way to make the JInternalFrames automatically get activated as soon as the mouse enters them?
I would like this in general, but specifically I need it for a drag'n drop operation. I want to drag an item from a JTable in one frame to another JTable in another frame. This works perfectly, even if the recepient frame is not active, what doesn't work is to scroll the recepient JTable using the mouse scrollwheel before dropping the item. This would work if the frame was active. (I tested this by temporarily placing the two JTables in the same internal frame)

Thanks, this looks promising, unfortunately I read the stuff about glass panes but I can't seem to make it work anyway. As I understand it the default glass panes should block all events. This does not happen, even when I turn the glass panes visible on all JInternalFrames and the main JFrame. Everything is just like it was before... With this I mean that mouse events were sent to the mouse listener I added to the glass pane, but the mouse events also went to the underlying JInternalFrames. And when a drag'n drop was active, no mouse events are reported. What glass pane should I make visible for it to intercept all events?

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