FlashGradColour
The FlashGradColour property defines the second alternate color that is used with a 3 color flash effect. When animated to use the flash feature, the object will alternate between the FillColour, the FlashFillColour, and the FlashGradColour.
The FlashGradColour works in exactly the same way as the FillColour except that it corresponds to the second alternate color for flash effects.