IsDesignMode - static method which determines whether the control is in Sitefinity design mode - you are editing a page. There are also
IsPreviewMode- determines whether the control is in Sitefinity preview mode.
IsBackend -determines whether a control instance is in backend.
protected override void OnPreRender(EventArgs e)
if(this.IsDesignMode() && !this.IsPreviewMode())
the Telerik team
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