NM_DBLCLK  _0VR1K 

The NM_DBLCLK notification message notifies the parent window of a control that the user has double-clicked the left mouse button within the control. NM_DBLCLK is sent in the form of a WM_NOTIFY1MZT7BR message.

NM_DBLCLK

pnmh = (NMHDR FAR *) lParam;