STN_DBLCLK  5QGUC. 

The STN_DBLCLK notification message is sent when the user double-clicks a static control that has the SS_NOTIFY style. The parent window of the control receives this notification message through the WM_COMMAND message.

STN_DBLCLK
idStatic = (int) LOWORD(wParam);    // identifier of static control
hwndStatic = (HWND) LOWORD(lParam); // handle of static control

See Also