RadEditor can be switched into three different edit modes: Editable,
Non Editable and No Permission.
Editable - in this mode the content of the RadEditor can be
edited right after the page is loaded in the client's browser.
Not Editable - in this mode the content is not editable when
the page is loaded in the browser, but can be switched to Editable by pressing
the Pencil button.
No Permission - in this mode the content is
not editable when the page is loaded and cannot be switched to Editable because
the Pencil button is not displayed. It is usable in situations where some users
of the application must be restricted from editing the content: