I think that there is a samo memory leak in RichTextEditorRibbonBar, so let me show you my very simple scenario:
One empty telerik radform with just one RichTextEditorRibbonBar.
1) Show form
2) Close form
3) Show form again
The result is new 30-50M in memory on each new form initsialization.
Plese give me some clue to deal with this problem.