The HDN_ITEMCLICK notification message notifies a header control's parent window that the user clicked the control. This notification message is sent in the form of a WM_NOTIFY message.
HDN_ITEMCLICK
phdr = (HD_NOTIFY FAR *) lParam;
Parameters
phdr
Pointer to an HD_NOTIFY structure that identifies the header control and specifies the index of the header item that was clicked and the mouse button used to click the item. The pitem member is set to NULL.
Return Values
No return value.
Remarks
A header control sends this notification message after the user releases the left mouse button.
See Also