Could you please set the ContentAreaMode property of RadEditor to DIV
<telerik:RadEditor ID="RadEditor1" ContentAreaMode="Div" runat="server"></telerik:RadEditor>?
This property renders the editor's content area as an editable DIV element, and the editor should not flickers and not automatically scroll when loaded in IE8 Modeless Dialog.
You can find more information about this property in the following live demo: http://demos.telerik.com/aspnet-ajax/editor/examples/contentareamodediv/defaultcs.aspx
If the DIV content area mode is not an option for you my recommendation is to use RadWindow or window.open instead of the currently used Modeless dialog
All the best,
the Telerik team
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