Hello Dan,
Are you following the approach for creating custom dialogs that is shown in this demo:
http://demos.telerik.com/aspnet-ajax/editor/examples/customdialogs/defaultcs.aspx? I have tested it (including the customized insert link dialog) and it seems to function as expected. As you can see in the code custom dialogs rely on internal functionality in the control which is why they work with passing arguments.
Kind regards,
Marin Bratanov
the Telerik team
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