The value set control draws only items that are represented in one of the formats described: text, color, bit maps, or icons.

If an application uses value set controls that contain items that are not represented by the supported formats or requires that the emphasized attribute of an item is to be drawn in a special manner, the application must specify those items as VIA_OWNERDRAW and those items must be drawn by the owner.

Through this message, the application can provide a custom value set background (the area between the items) and customize the area surrounding the value set (the area on the top and right sides of the value set that is left over when the value set calculates its size). The application can specify how either or both of these areas are drawn and is given the opportunity to do so.

The value set control window procedure generates this message and sends it to its owner, informing the owner that something is to be drawn. The owner is given the opportunity to draw and to indicate whether the value set control should continue with the normal drawing of that component.