Any foreground and background colors specified in the program are used. If the background color is not specified, the owning subwindow's background color is used. If the foreground color is not specified, a system-default color is used. Note that color handling in combo boxes is tricky because there are several components that make up a control. You will not be able to control all of the colors shown using just foreground and background colors. For this reason, we suggest using the default colors.