When there are several instances of RadRichTextBox in the same page/view, it would be nice if only one instance display any selection. 

In the same scenario, the color of the selection of TextBox, for example, changes. Clearing the selection on LostFocus would have been a solution, however control loses focus to the color pickers, comboboxes, etc. from the SelectionMiniToolBar and RadRichTextBoxRibbonUI.