Canvas.resizeBackground Method
        
 Resizes the canvas background (actual dashboard surface).
 
         
        Parameters
        
            - width
            
 
            - 
                
Type: Number - May be null
(Optional) Width dimension in pixels, if null, force the canvas to redraw the background as the same width. 
            - height
            
 
            - 
                
Type: Number - May be null
(Optional) Height dimension in pixels. if null, force the canvas to redraw the background as the same height. 
            - isNotUndoable
            
 
            - 
                
Type: boolean
(Optional) True to make this not undoable.