mRemoteNG/mRemoteV1/UI/Controls/HeadlessTabControl.cs

using System;
using System.Windows.Forms;
using mRemoteNG.App;

namespace mRemoteNG.UI.Controls
{
    public class HeadlessTabControl : TabControl
    {
        protected override void WndProc(ref Message m)
        {
            // Hide tabs by trapping the TCM_ADJUSTRECT message
            if (m.Msg == NativeMethods.TCM_ADJUSTRECT && !DesignMode)
                m.Result = (IntPtr)1;
            else
                base.WndProc(ref m);
        }
    }
}