Hello Vic,

It’s entirely up to Visual Studio to detect the references that are required and we have no control over this process. Visual Studio just gets the references that are directly referenced by the class and load them, but not the dependencies of those references. A way to work around it is to reference types that exist in the other assemblies.

I am sending you a simple control created by me which you could add to the toolbox. Please see attached zip and notice how types that exist in the other assemblies are referenced in order to be loaded.

public partial class UserControl1 : UltraButton

    {

        private Infragistics.Win.UIElement pointlessUIElement;

        private Infragistics.Shared.DisposableObject pointlessDisposableObject;

        public UserControl1()

        {

            InitializeComponent();

        }

        private void ultraButton1_Click(object sender, EventArgs e)

        {

            MessageBox.Show("I'am a control");

        }

    }