I noticed that the TAdvGlowButtons have DisabledImages, HotImages and Images. I decided to use it. png pictures I attached using TVirtualImageList. The buttons have UIstyle activated.
I disappointed. HotImages do not appear in any way. I've tried all the settings related to that.
I cannot reproduce an issue.
Please isolate this and send a sample source project with which we can reproduce this here.
I was convinced that HotImages would appear bigger than others. I see that's not true.
So that's okay.
The magnification effect can be achieved by enlarging the size of the HotImage by a few pixels. 
When using TImageCollection + TVirtualImageList.