Please explain the behavior with more details if possible. Did you drag the controls from the toolbox to the page? Did you try to add the control manually? I mean to write a code as shown below.
<telerik:RadGrid ID="RadGrid1" runat="server"></telerik:RadGrid>
In case you are experiencing errors it would be helpful to make a screenshot and send it to us attached to a regular support ticket.
the Telerik team
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