You can disable RadEditor by setting RadEditor1.Enabled = False in the codebehind.
You can do that for example in the Page_Load event, in a button click or another handler, e.g.
Protected Sub form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles form1.Load
RadEditor1.Enabled = False
End Sub
For your convenience I have attached a sample project.
All the best,
Rumen
the Telerik team
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