Custom controls and the VS Toolbox

I wonder what can be a cause for the non-apparition of custom/user controls in the Visual Studio Toolbar.

Thanks.

I have a solution with some projects and a lot of custom controls. Normally, these controls should appear in the 开发者_开发百科toolbar automatically after the solution (re)build... (I use VS2005, but this problem appears also in 2008)

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Tools -> Options -> Windows Form Designer -> General -> AutoToolboxPopulate

Set that to true.

(Visual Studio 2005)

Note: The current solution must be closed and reopened for the setting to take place (in case you don't read the description.)