Hello Luigi Palazzo,
The capability of the RadButtonElement in RadRibbonbar to wrap text relates to modifications of the RadRibbonBar itself. Unfortunately, this will take us some time to do and I cannot give you an exact time frame at this time.
The only workaround for the time being is to manually set the text on different lines, using the '\n' escape sequence:
|this.radButtonElement1.Text = "This is \n some text";
Should you prefer do use the Visual Studio designer, go to the property grid and then set the text in the Text drop down on different lines, using the Enter key.
the Telerik team
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