does not have a public property named RootFolders

When I put the control into Visual Studio designer, it displays a placeholder image with the error:

Error Creating Control - FileVistaControl1

Type System.Web.UI.UserControl does not have a public property named RootFolders

The control displays properly and seems to work (except for my other thread) otherwise.  This is just within the VS Designer.

Thanks,
Joe

The design-mode is not supported, you either edit the properties of the control in markup or codebehind at this time.