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An ImageList is a supporting control that is typically used by other controls, such as a ListView but is exposed as a component to developers. We can use this component in our applications when we are building our own controls such as a photo gallery or an image rotator control.  

Adds a specified image to the list of images to be used as overlay masks. An image list can have up to four overlay masks in version 4.70 and earlier and up to 15 in version 4.71. The function assigns an overlay mask index to the specified image.