SmallMultipleCanvas.appendTemplateCellRows Method
        
 Append new rows of template cells
         
        Parameters
        
            - heights
            
 
            - 
                
Type: Array
ElementType: number
A list of the heights of the rows to be appended 
            - targetLayer
            
 
            - 
                
Type: Layer - May be null
(Optional) Specify the layer at which the template cell rows are appended to. 
        
        Return Value
        
Type: Array
        
ElementType: TemplateCellViewModel
        
The list of new template cell view models created.