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Editorial Team
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Asked: 2026-05-18T20:34:35+00:00

I recently created my first custom control. I attempted to add it in a

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I recently created my first custom control. I attempted to add it in a separate project I have constructed.

I recieve this error:
The type ‘System.Windows.Controls.Control’ is defined in an assembly that is not referenced. You must add a reference to assembly

Here are the steps I took to add the control.

  1. Add the Custom Control as a Reference in project
  2. Add the attribute xmlns:MyNamespace=”clr-namespace:CustomControls;assembly=CustomControls” to the root element of the markup file where it is being used
  3. Rebuild the Controller and the project
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1 Answer

  1. Editorial Team

    You also need a reference to PresentationFramework.dll

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