We have added Select2Cell Editor for backgrid, eariler as it was not present & causing issue in rendering in subnode control.
Looks good to me, but - have some feedback.
1. Can you please mention - why do we need 'openOnEnter: false' in select2 options?
2. There is a difference between UI, when rendered from the editor, and from the Select2Cell. (I can see padding, when the Cell is rendered, but - not when editor is rendered.)