Gets the colors used to tint the background fill of the component.
Set this to an Array of either two or four unit values that specify RGB colors. Elements 0 and 1 specify the start and end values for a color gradient. If elements 2 and 3 exist, they are used instead of elements 0 and 1 when the component is in a mouse-over state. For a flat-looking control, set the same color for elements 0 and 1 and for elements 2 and 3, The default value is [ 0xFFFFFF, 0xCCCCCC, 0xFFFFFF, 0xEEEEEE ].
Some components, such as the ApplicationControlBar container, have a different default value. For the ApplicationControlBar container, the default value is [ 0xFFFFFF, 0xFFFFFF ].
Deprecated Since 3.0: Use headerStyleName