Processing the WM_INITDIALOG and WM_DESTROY Messages in an Owner-Drawn Dialog
When you use a combo box in a dialog box, you usually respond to a WM_INITDIALOG
message by initializing the combo box. The example in Creating a Square Meal Dialog Box
loads the bitmaps used for the owner-drawn combo box, then calls the
application-defined InitGroupList function to initialize the combo box. It also selects
the first list item in the combo box, then calls the application-defined
InitFoodList function to initialize the list box.
In the example, the owner-drawn combo box is a drop-down list box containing
the names of each of the four food groups. InitGroupList adds the name of each
food group, and calls the application-defined SetItemData function to associate
a constant with each list item that identifies a corresponding food group.
The list box in the example contains the names of foods in the selected food
group. InitFoodList resets the contents of the list box, then adds the names of
the current food selection in the current food group drop-down list box.
The dialog box procedure processes the WM_DESTROY
message to delete the bitmaps in the owner-drawn combo box.
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