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    <p>Just create a new Control. It works fine for me.</p> <pre><code>using System; using System.ComponentModel; using System.Windows.Forms; using System.Runtime.InteropServices; public class RichTextBox5 : RichTextBox { private static IntPtr moduleHandle; protected override CreateParams CreateParams { get { if (moduleHandle == IntPtr.Zero) { moduleHandle = LoadLibrary("msftedit.dll"); if ((long)moduleHandle &lt; 0x20) throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not load Msftedit.dll"); } CreateParams createParams = base.CreateParams; createParams.ClassName = "RichEdit50W"; if (this.Multiline) { if (((this.ScrollBars &amp; RichTextBoxScrollBars.Horizontal) != RichTextBoxScrollBars.None) &amp;&amp; !base.WordWrap) { createParams.Style |= 0x100000; if ((this.ScrollBars &amp; ((RichTextBoxScrollBars)0x10)) != RichTextBoxScrollBars.None) { createParams.Style |= 0x2000; } } if ((this.ScrollBars &amp; RichTextBoxScrollBars.Vertical) != RichTextBoxScrollBars.None) { createParams.Style |= 0x200000; if ((this.ScrollBars &amp; ((RichTextBoxScrollBars)0x10)) != RichTextBoxScrollBars.None) { createParams.Style |= 0x2000; } } } if ((BorderStyle.FixedSingle == base.BorderStyle) &amp;&amp; ((createParams.Style &amp; 0x800000) != 0)) { createParams.Style &amp;= -8388609; createParams.ExStyle |= 0x200; } return createParams; } } // P/Invoke declarations [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] private static extern IntPtr LoadLibrary(string path); } </code></pre>
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