At the beginning of each paint cycle, the control sends the NM_CUSTOMDRAW notification message, which specifies the CDDS_PREPAINT value in the dwDrawStage member of the accompanying NMCUSTOMDRAW structure. The value that your application returns to this first notification dictates how and when the control sends subsequent custom draw notifications for the rest of that paint cycle. In response to the first notification, your application can return a combination of flags, as described in the following table.
| Return value | Effect |
|---|---|
| CDRF_DODEFAULT | The control draws itself. It does not send additional NM_CUSTOMDRAW messages for this paint cycle. This flag cannot be used with any other flag. |
| CDRF_NOTIFYITEDRAW | The control notifies the parent of any item-specific drawing operations. It sends NM_CUSTOMDRAW notification messages before and after it draws items. |