MSG-TV-SELCHANGE (value 16412)

This event occurs when the selection has changed in a Tree View control. The ID of the new item is contained in EVENT-DATA-2. EVENT-DATA-1 contains the cause of the change. It is one of the following values (found in acugui.def):

TVFLAG MOUSE New item selected with mouse
TVFLAG KEYBOARD New item selected with keyboard
TVFLAG PROGRAM Program changed selected item