RepeaterCanvas.appendTemplateCellColumns Method
        
 Append new columns of template cells
         
        Parameters
        
            - widths
            
 
            - 
                
Type: Array
ElementType: number
A list of the widths of the columns to be appended 
        
        Return Value
        
Type: Array
        
ElementType: TemplateCellViewModel
        
The list of new template cell view models created.