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[DllImport("user32.dll")]
static extern long GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll")]
static extern long SetWindowLong(IntPtr hWnd, int nIndex, long value);
private void Form1_Load(object sender, EventArgs e)
{
foreach (Control c in this.Controls)
{
if (c is MdiClient)
{
IntPtr h = c.Handle;
SetWindowLong(h, -16, GetWindowLong(h, -16) & ~0x00800000L);
SetWindowLong(h, -20, GetWindowLong(h, -20) & ~0x00000200L);
break;
}
}
}