This code specifies that the user has double-clicked a string. The control's parent window receives this code through a WM_COMMAND message from the control.
| Parameter | Description |
| wParam | Contains the wParam parameter of the WM_COMMAND message, and specifies the control ID. | |
| lParam | Contains an edit-control window handle in its low-order word and the LBN_DBLCLK code in its high-order word. |
This code applies only to list-box controls that have LBS_NOTIFY style.