RAD Studio VCL Reference
TComboExItem.OverlayImageIndex Property

Identifies an overlay mask that is used to mask out portions of the image and selected image.

property OverlayImageIndex: TImageIndex;
__property TImageIndex OverlayImageIndex;

Set OverlayImageIndex to use an overlay mask with the images that the ImageIndex and SelectedImageIndex properties identify. An overlay mask is a black-and-white bitmap that is combined with another image so that every place the overlay mask is white appears transparent in the other image. 

OverlayImageIndex is an index into the Images property of the combo box. If OverlayImageIndex is -1, this item does not use an overlay mask. 


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