Update load-on-demand-hierarchy.md

Author: DinkoK

controls/gridview/hierarchical-grid/load-on-demand-hierarchy.md

@@ -29,7 +29,7 @@ In many cases you may need to load your data not when RadGridView is being initi
 
 1. Handle the __RowSourceNeeded__ event to populate the data for each parent row.
 
->note Calling the the __BestFitColumns__ method may cause the grid to load all the data explicitly. Call this method with the for the visual cells only.
+>note Calling the the __BestFitColumns__ method may cause the grid to load all the data explicitly. Call this method with the __BestFitColumnMode.DisplayedCells__ parameter for the visual cells only.
 
 ## Sample Load-On-Demand Scenario