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Home/ Questions/Q 174421
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Asked: May 11, 20262026-05-11T13:31:09+00:00 2026-05-11T13:31:09+00:00

I have a class in an external library subclassing UserControl and set to public.

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I have a class in an external library subclassing UserControl and set to public. Now I want to use this usercontrol in my main WinForms app. I have added this external library to the references of the main app, but the user control haven’t appeard in the Toolbox – I have been told it should appear.

I am doing this for the first time. So, sorry if my question is too trivial.

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  1. 2026-05-11T13:31:10+00:00Added an answer on May 11, 2026 at 1:31 pm
    1. Right click on the title panel, in the Toolbox, where you want the control.
    2. Select Choose Items…
    3. Click the Browse… button on the .NET Framework Components tab in the dialog that pops up (might take a few seconds for it to show)
    4. Navigate to the external library, select the file and click Open.

    All public controls from that library are now available for selection.

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