Hi Michael,
Thank you for your good question!
The control does not offer a server-side, but a client-side set_status method for changing its status text so you will need to call it via the help of the .NET ClientScript.RegisterStartupScript or ScriptManager.RegisterClientScriptBlock method from the server:
string script = "<script>setTimeout(function () { $find('RadWindow1').set_status('test'); }, 1000);</script>";
ClientScript.RegisterStartupScript(this.GetType(), "Status", script);
Regards,
Rumen
Progress Telerik
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