cli C++ how can I see my user control in toolbox?

I created A project, and in the A project, i created a Form named bform and a user control named cComtermizedCtrl , and i compiled the project successfully ,but I coundn't fi开发者_如何学Pythonnd the cComtermizedCtrl control in toolbox. why?

Tools + Options, Windows Forms Designer, General. Ensure that the AutoToolboxPopulate setting is True.