How to change a custom toolbar button icon when clicked?
I added a custom button to the toolbar. And I was wondering whether it'd be possible to change the button's icon when clicked. UE4's buttons don't do this and I found some hardcoded values set, e.g. from NiagaraEditorStyle.cpp
Note the Small, Default, Needed keywords. I wasn't able to find where these are used or accessed. Maybe there is a .Hovered, .Clicked option? Where are these values being used?
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