If your application returns CDRF_NOTIFYITEMDRAW to the initial prepaint custom draw notification, the control sends notifications for each item it draws during that paint cycle. These item-specific notifications have the CDDS_ITEMPREPAINT value in the dwDrawStage member of the accompanying NMCUSTOMDRAW structure. Your application can request that the control send another notification when it is done drawing the item by returning CDRF_NOTIFYPOSTPAINT to these item-specific notifications. Otherwise, your application can return CDRF_DODEFAULT and the control will not notify the parent window until it starts to draw the next item.