According to: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/editcontrols/editcontrolreference/editcontrolmessages/en_vscroll.asp This message is sent for the following mouse events on the vertical scroll bar: clicking either arrow button or clicking between the arrow button and the thumb. However, the message is not sent when clicking the scroll bar mouse itself. The message is also sent when a keyboard event causes a change in the view area of the edit control, for example, pressing HOME, END, PAGE UP, PAGE DOWN, UP ARROW, or DOWN ARROW. How can I capture the scroll event when the user drags the actual scrollbar? (SB_THUMBTRACK) Any pointsers would be very helpful. I'm writing this in pure c/win32api. I am using a Richedit 1.0 common control. Also, I have turned on the ENM_MOUSEEVENTS & ENM_SCROLL event masks. I can capture EN_VSCROLL just fine. -Tyler Kellen