The Firefox rich text editing engine of Firefox, does not allow to select radio, check box and select elements in an editable iframe as the content area of RadEditor and for this reason we do not offer the ability to modify the properties of these elements in Firefox.
You can edit the properties of the radio and checkbox elements in IE.
RadEditor does not offer the requested feature to edit the select elements out-of-the box, but you can implement them using custom dialogs
. For your convenience I have attached an example demonstrating how to edit, add or remove select element items from a custom dialog
the Telerik team
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