RepeaterTemplateCellViewModel.getStickyHeaderTemplateCellIds Method
        
Retrieve the IDs of the template cell that needs to be placed into the sticky header
         
        Parameters
        
            - isScrollingDown
            
 
            - 
                
Type: boolean
True if scrolling down 
            - currentStickyHeaderTemplateCellIds
            
 
            - 
                
Type: Array
ElementType: string
The ordered list of templateCellIDs that is currently stuck to the sticky header 
        
        Return Value
        
Type: Array
        
ElementType: String
        
An ordered list of templateCellIDs that are stuck.