I´d appreciate an event that is called whenever there is a change of Top cell (row). Several times I needed to "align" visible content of two objects (listboxes, trees, etc.). Value change or mouse scroll event can be used but still I´ve found no way how to catch when the user uses scrollbar arrows or draging scrollbar position indicator. The only solution I found is to keep it aligned by periodically reading out Top row visible property of one object and set it for another one. That requires code in Timeout event that is called very often (otherwise it is noticeable for user) causing performance drop.
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