There is no property that can be used for setting the text of the button. We have added this issue in our todo list so you can see the current status of the fix here:
For now you can use one of the following :
1.The image approach using : ApplicationButtonImageSource
2.ApplicationButtonStyle to entirely customize the appearance of the button
As to the question about RadRibbonWindow when you have RibbonBar in it you have to use WindowIconVisibility="Collapsed":
<telerikRibbonBar:RadRibbonBar Title="test" WindowIconVisibility="Collapsed"
I hope that this will help you please let us know if you have any other questions or need some more help.
the Telerik team
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