Why doesn't it repaint JTree after covering my frame with another window?

Hi, everybody!
I have a simple application: there is a frame with a horizontal JSplitPane. The right component of this split pane is a JScrollPane with a geographic map (I really have a lot to draw). The left component of the main (horizontal) split pane is another JSplitPane - the vertical one. And I have a JTree on the left component of the vertical split pane.
Problem:
Any window that is dragged over my application erases the tree, main menu, and dividers of both split panes. (But it doesn't erase my map!). I even can "erase" my GUI with a message box! And more... My GUI restores when I change the frame size or if the tool tip expression over my tree appears. And everything is OK when I manipulate my GUI with no map on a scroll pane.
I'd appreciate deeply any working solution. Thanks a lot.
Konstantin

Thanks, PhHein :) Good guess... Any other ideas?

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