RangeClass.setupLegendItem Method
        
 Sets up a legend item to identify this class assuming a rectangular shape.
 
         
        Parameters
        
            - legendItem
            
 
            - 
                
Type: LegendItem 
            - bindingRule
            
 
            - 
                
Type: BindingRule
The binding rule. 
            - isTextOnly
            
 
            - 
                
Type: Boolean
true to set up only text and category properties.
Optional: True 
        
        Return Value
        
Type: Boolean
        
True if the legend item is set up successfully, or false if it should not be displayed.