The background editor is used to control the background of elements, which require standard and artistic (image) borders. It also controls the filling of the area displayed in the frame (via its FillEffect property).
The FrameType property controls the type of the frame that is used. When this property is set to Standard, the properties of the StandardFrame object accessible from the StandardFrame property control the applied frame. Analogously, when set to Image, the properties of the ImageFrame object accessible from the ImageFrame property control the settings of the applied image frame.