Hello Emanuel Varga,
Thank you for the question.
In Q1 2010 we introduced our new styling mechanism and for Q1 2010 SP2 we reworked most of our predefined themes according to this mechanism. This change reflected on the way you need to put a RadButton in a MouseOver state. Please consider the following code snippet:
currentaValue = target.ButtonElement.ButtonFillElement.IsMouseOver;
target.ButtonElement.IsMouseOver = !currentaValue;
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