C# extended control not appearing in Toolbox

1 week ago 10
ARTICLE AD BOX

I'm new to C# and I'm currently trying to extend a control. The project compiles fine, but unlike every other tutorial/resource I've seen, the extended control does not show up in the toolbox.

This is also the case if I create a new UserControl and change literally nothing to the default template: even after compiling, the toolbox stays blank.

Any ideas?

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