MDIChildren flickering problem while switching between child form with dockstyle.fill and borderstyle.none

Question

I have an mdi applicaton in Visual studio 2010 (.Net framework 4.0). I'm having a flickering problem when user switch between an MDI Child form. I'm declaring the child form then setting the borderstyle.none at design time and dock property to fill
through programming and make them a MDIChildren before I show them so that it takes up the entire space of the MDI Parent window without being maximized (client request). 
i don't want to display control box(minimize, maximize,close) of child form in mdi parent form. (client request)
The problem is that when the child form is being displayed it is briefly shown in it's default size with icon and control box before being resized to fill the available area on the MDI Parent form. When a Child Form loads, you can see it in it's original
size (the size from Design-time) then all this flickering while maximizing .
In other words, child form show up in the client area of the MDIForm, not maximized, with a caption, very shortly, before they are finally filling the client area. there is a short flicker when a new form is created and displayed. This process is most noticeable
with a not-so-powerful PC or there are lots of control inside child form.
below is my code to show child form 
   MyChild1 c1 = new MyChild1();
                            c1.MdiParent = MdiMainParent;
                            c1.Dock = DockStyle.Fill;
   c1.Show(); 
how can i solved the problem of flickering issue?
I tried many options which i have described below
1.double buffering.
2.set style property to child form
      this.SetStyle(ControlStyles.UserPaint, true);
      this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
      this.SetStyle(ControlStyles.DoubleBuffer, true); 
3. override below method in each child form
protected override CreateParams CreateParams
            get
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= 0x02000000;
                return cp;
4. override below method in each child form
  const int WM_NCPAINT = 0x85;
        const int WM_SIZE = 0x05;
        protected override void WndProc(ref Message m)
            if (m.Msg == WM_NCPAINT)
                if (this.WindowState == FormWindowState.Maximized)
                    return;
            if (m.Msg == WM_SIZE)
                if (this.WindowState == FormWindowState.Maximized)
                    return;
            base.WndProc(ref m);
but I didn't see any effects.  please someone help me to resolve flickering issue. thanks in advance.

Answer 1

Hi hardikvaishnav,
This is a known issue which has been reported to Microsoft Connect. Unfortunately, this issue will not fix due to stability issues around MDI. For more details, see 
https://connect.microsoft.com/VisualStudio/feedback/details/97787/border-of-mdi-child-form-flashes-up-despite-formborderstyle-none.
You might use a user control or panel instead.
Best Regards,
Bob Wu [MSFT]
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