NM_RDBLCLK  H827OI 

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

NM_RDBLCLK

pnmh = (NMHDR FAR *) lParam;