Mine

Index: System.Windows.Forms/MdiChildContext.cs
===================================================================
--- System.Windows.Forms/MdiChildContext.cs     (revision 57642)
+++ System.Windows.Forms/MdiChildContext.cs     (working copy)
@@ -364,7 +364,7 @@
                        virtual_position.Width = form.Width;
                        virtual_position.Height = form.Height;

-                       mdi_container.EnsureScrollBars (virtual_position.Right, virtual_position.Bottom);
+                       //mdi_container.EnsureScrollBars (virtual_position.Right, virtual_position.Bottom);

                        DrawVirtualPosition ();
                }