Re-render entire datasheet if sheet has changed.

Author: anmcgrath

src/BlazorDatasheet/DatasheetPane.razor

@@ -114,6 +114,8 @@
             _visualCellCache.Clear();
 
             AddSheetEvents();
+
+            _forceRender = true;
         }
 
         _cellLayoutProvider.ViewRegion = ViewRegion;