The BackColor property specifies the control's background color. The ParentBackColor / ParentBackAlpha property specifies the color / transparency to show the parent portion of the radial menu. The ParentSize property specifies the size to display the parent zone.  The SubItemsBackColor / SubItemsBackAlpha property specifies the color to show the sub-items zone of the radial menu. The SubItemsSize property specifies the size to display the sub-items zone. The ItemsBackColor / ItemsBackAlpha property Specifies the color to show the items portion of the radial menu. The BackgroundPicture property indicates the picture to be shown on the radial menu's background.

The following screen shot, shows the portions/parts/zones of the radial menu: