WinForm designer is broken in case using customer UserControl, and the platform target is x64

[Jimmy Qin]

Here is very basic example.

When create a WinForm project and set the target platform to x64.

The designer will always give you error, when open the UserControlTest.

Any idea if it's by design or a VS bug?

the base class UserControlBase.cs

using System.Windows.Forms;

namespace WindowsFormsTest
{
public class UserControlBase : UserControl
{
}
}


the Test class UserControlTest.cs

namespace WindowsFormsTest
{
public partial class UserControlTest : UserControlBase
{
public UserControlTest()
{
InitializeComponent();
}
}
}

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