If your toolbox items are not visible in Visual Studio 2012, you can try to clear the local cache of the toolbox hidden files and restart Visual studio it should reset the Toolbox to its default settings.
The items to be deleted are:
toolbox.tbd,
toolbox_reset.tbd,
toolboxIndex.tbd,
toolboxIndex_reset.tbd
They can be found in C:\Users\UserName\AppData\Local\Microsoft\VSA\9.0
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