MSG-SB-THUMBTRACK (value 16390)

This event occurs when the user moves a scroll bar's slider that has the TRACK-THUMB style. When this message is sent to the scroll bar's event procedure, the program does not reset the control's position in response. EVENT-DATA-2 contains the new position. EVENT-DATA-1 is not used. This scroll bar message is the only one that should not change the slider's position.