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The size mode of the RadButtonElement by default is AutoSize=True - in this case, the size of the RadButtonElement depends only on its content. In case that you removed all content (text & image), the button element will be with empty size and this leads to the exception in carousel's reflection primitive. So if you want to show an empty button turn off the AutoSize
and set an appropriate MinSize
However, I cannot reproduce the issue locally because the button still has 2,2 size after removing the text (refer to the screenshot).
Hope this helps.
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