LBN_SELCHANGE

This code specifies that the selection in a list box has changed. 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 a list-box window handle in its low-order word and the LBN_SELCHANGE code in its high-order word.  

Comments

This code applies only to list-box controls that have LBS_NOTIFY style.