Move and Resize a Control or a Borderless Form - using window messages (smooth!)

[arcanine]

I hate to resurrect an old thread, but I've started fooling with this code again. Pertaining to moving a control within a form, I've noticed that the cursor cannot be moved outside of the client rectangle of the form that the control is on. Does anyone know how windows determines the clip rectangle in this case? I feel that if we can specify the clip rectangle (maybe using ClipCursor) then we can handle the control's Min/Max size. If we are able to set the cursor clip, it would only take a little logic and math to get the clip rectangle right.

Edit

So I've managed to use the user32.dll ClipCursor function to limit the movement of the mouse. However, when your code calls the SendMessage function, the ClipCursor bounds are reset. I know almost nothing about the user32 functions, so I'm really over my head on this stuff. I'm guessing though, by the other posts, that it's just not possible. With my quick skim of the MSDN articles pertaining to user32.dll functions, it seems like it should be possible.

Excerpts from your code (without the ClipCursor stuff, since it didn't work):

    Private Sub MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs)
        If e.Button = Windows.Forms.MouseButtons.Left Then
            If resizeDir = ResizeDirection.None Then
                If Me.AllowMoving Then MoveControl(_ctrl.Handle)
            Else
                If (Me.AllowResizeFlags And resizeDir) = resizeDir Then
                    ResizeControl(_ctrl.Handle, resizeDir)
                End If
            End If
        End If
    End Sub

    Private Sub ResizeControl(ByVal hWnd As IntPtr, ByVal direction As ResizeDirection)
        Dim dir As Integer = -1

        Select Case direction
            Case ResizeDirection.Left
                dir = HTLEFT
            Case ResizeDirection.TopLeft
                dir = HTTOPLEFT
            Case ResizeDirection.Top
                dir = HTTOP
            Case ResizeDirection.TopRight
                dir = HTTOPRIGHT
            Case ResizeDirection.Right
                dir = HTRIGHT
            Case ResizeDirection.BottomRight
                dir = HTBOTTOMRIGHT
            Case ResizeDirection.Bottom
                dir = HTBOTTOM
            Case ResizeDirection.BottomLeft
                dir = HTBOTTOMLEFT
        End Select

        If dir <> -1 Then
            ReleaseCapture()
            SendMessage(hWnd, WM_NCLBUTTONDOWN, dir, 0)
        End If
    End Sub

Edit

No ideas?