Hi Eric Marthinsen,
Thank you for using our services.
You can check if the current page is in design mode and if it is you can clear the controls collection of the user control and add a literal saying that the control cannot be rendered in design mode:
sender, EventArgs e)
CmsPageBase currentPage = (CmsPageBase)
(currentPage.PageMode == CmsPageMode.Edit)
Literal literal =
"the control cannot be rendered in design mode"
//other control logic
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