I've been successful in putting a WPF textbox into an existing windows form using ElementHost and a user control. It looks like the following:

Public Class MyUserControl
    Private _elementHost as ElementHost = New ElementHost
    Private _wpfTextbox as System.Windows.Controls.Textbox = New System.Windows.Controls.Textbox

    Public Sub New()
        Me.Controls.Add(_elementHost)
        _elementHost.Dock = DockStyle.Fill
        _elementHost.Child = _wpfTextbox
        _wpfTextbox.SpellCheck.IsEnabled = True
    End Sub
End Class

Now, when I put this user control onto a windows form, it accepts keyboard input and the form itself can get text from the textbox. However, when I try to handle keypress (or keydown, keyup) events from the user control, nothing happens.

I've looked into this problem and did a bit of research but now I'm a little confused as to what I really need to be looking at. The following are the topics that I am somewhat confused about.

• HwndSource
• Relaxed delegates
• WPF routed events

If I am interpreting everything correctly, input from WPF textboxes are handled differently compared to regular form textboxes. It seems like both aren't compatible with each other but there must be some way to "pass" keys from one to another?

I'd appreciate any help.