I have written a form with some specific handling routines. All focus automatically shifts OUT of grid (to text search box) when clicked within grid (after moving focus). I have also modified the SCROLLED method of the grid to catch display changes when clicking and/or dragging on the vertical scrollbar.

This works except when I click somewhere on the middle of the scroll bar (not on the slidebox nor on either the top or bottom arrow... the grid moves accordingly but the inbetween area that I clicked on turns black and stays black. Where is that coming from?