Dojo GridX 'onRender' Method Called Twice: Why and What to Do

This behavior is likely due to the way GridX implements virtual scrolling for performance. GridX only renders rows currently visible on the screen. When scrolling, GridX re-renders new rows and removes old ones from the visible area. This can lead to the 'onRender' method being called twice: once when new rows are rendered and again when old rows are removed. This is expected behavior in GridX and doesn't require any special handling.