One possible way to achieve the described behavior is to bind the Image's height to the height of any RadRibbonTab.
So when you set those tab a value for its Height property or change it the image in the ApplicationButton will change its height accordingly.
On the other hand if you want to change the font size of the RadRibbonTabs
there is no problem to do it when the Height of the image is set.
I attached the updated solution where you can find my implementation of the both approaches. Also please have in mind that the height of the ApplicationButton
can't be less than 24.
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