WPF TextBox not accepting Input when in ElementHost in Window Forms

Question

We are developing a UI Control in WPF to be consumed within an existing Windows Forms / MFC application engine (Rhino 3D).

The application engine exposes the ability

Answer 1

It is not necessary to create derived TextBox. The code for IOTextBox can be used in a UserControl hosting textboxes. I have successfully tested it with WPF control used for custom options page used in VS2010 package.