When removing grouped nodes from RTView, we get the red box. Try this script:
view := RTView new.
menuBuilder := RTMenuBuilder new view: view.
menuBuilder menu: 'Click Me' background: Color gray callback: [
view clean.
].
group := RTGroup new.
(1 to: 10) do: [:each| group add: ((RTBox new borderColor: (Color green); elementOn:each)
@ RTDraggable;
+(RTLabel new color: (Color red);
text: each asString; yourself))].
view add: group.
RTVerticalLineLayout on: view elements.
view open.