[C#] UserControl not displayed in toolbox

[ UserControl not show in toolbox ]
When you create a UserControl, you'll usually see it right in the toolbox after Rebuild Project.
But sometimes you will not see your UserControl in the toolbox, to solve it you can do in the following way:

Open Microsoft Visual Studio 2008 and set this option:
Tools > Options > Windows Forms Designer > General : AutoToolboxPopulate

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