To make the RadLinkButton control even easier to work with, we have provided a set of built-in icons that can be 
        displayed on the button.
        Simply set the predefined CSS class to the CssClass property. All of the predefined classes are shown in the example 
        and can be used for reference.
    
    
        For example, using CssClass='rbOk' will render the embedded OK icon on the 
        left side of the button.