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    <p>It may not be necessary to dive into "WndProc" either. This was done without it:</p> <p><img src="https://i.stack.imgur.com/YjX45.jpg" alt="This was done without &quot;WndProc&quot;"></p> <p>The Question really is how do you make a "nice looking" TextBox, because as described by j__m, you can just use ToolStripControlHost, to host a custom control in your tool strip. </p> <p>More here: <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.toolstripcontrolhost.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.windows.forms.toolstripcontrolhost.aspx</a></p> <p>And as documented, the control you use can be a Custom Control.</p> <p>Firstly, It's insanely tricky to make a custom TextBox Control. If you want to go:</p> <pre><code>public partial class TextBoxOwnerDraw : TextBox </code></pre> <p>You are in for HUGE trouble! But it doesn't have to be. Here is a little trick:</p> <p>If you make a custom control as a Panel, then add the TextBox to the Panel, then set the Textbox borders to None... you can achieve the result as above, and best of all, its just a regular old TextBox, so cut copy paste all works, right click works!</p> <p>Ok, here is the code for a nice looking textbox:</p> <pre><code>public partial class TextBoxOwnerDraw : Panel { private TextBox MyTextBox; private int cornerRadius = 1; private Color borderColor = Color.Black; private int borderSize = 1; private Size preferredSize = new Size(120, 25); // Use 25 for height, so it sits in the middle /// &lt;summary&gt; /// Access the textbox /// &lt;/summary&gt; public TextBox TextBox { get { return MyTextBox; } } public int CornerRadius { get { return cornerRadius; } set { cornerRadius = value; RestyleTextBox(); this.Invalidate(); } } public Color BorderColor { get { return borderColor; } set { borderColor = value; RestyleTextBox(); this.Invalidate(); } } public int BorderSize { get { return borderSize; } set { borderSize = value; RestyleTextBox(); this.Invalidate(); } } public Size PrefSize { get { return preferredSize; } set { preferredSize = value; RestyleTextBox(); this.Invalidate(); } } public TextBoxOwnerDraw() { MyTextBox = new TextBox(); this.Controls.Add(MyTextBox); RestyleTextBox(); } private void RestyleTextBox() { double TopPos = Math.Floor(((double)this.preferredSize.Height / 2) - ((double)MyTextBox.Height / 2)); MyTextBox.BackColor = Color.White; MyTextBox.BorderStyle = BorderStyle.None; MyTextBox.Multiline = false; MyTextBox.Top = (int)TopPos; MyTextBox.Left = this.BorderSize; MyTextBox.Width = preferredSize.Width - (this.BorderSize * 2); this.Height = MyTextBox.Height + (this.BorderSize * 2); // Will be ignored, but if you use elsewhere this.Width = preferredSize.Width; } protected override void OnPaint(PaintEventArgs e) { if (cornerRadius &gt; 0 &amp;&amp; borderSize &gt; 0) { Graphics g = e.Graphics; g.SmoothingMode = SmoothingMode.AntiAlias; Rectangle cRect = this.ClientRectangle; Rectangle safeRect = new Rectangle(cRect.X, cRect.Y, cRect.Width - this.BorderSize, cRect.Height - this.BorderSize); // Background color using (Brush bgBrush = new SolidBrush(MyTextBox.BackColor)) { DrawRoundRect(g, bgBrush, safeRect, (float)this.CornerRadius); } // Border using (Pen borderPen = new Pen(this.BorderColor, (float)this.BorderSize)) { DrawRoundRect(g, borderPen, safeRect, (float)this.CornerRadius); } } base.OnPaint(e); } #region Private Methods private GraphicsPath getRoundRect(int x, int y, int width, int height, float radius) { GraphicsPath gp = new GraphicsPath(); gp.AddLine(x + radius, y, x + width - (radius * 2), y); // Line gp.AddArc(x + width - (radius * 2), y, radius * 2, radius * 2, 270, 90); // Corner (Top Right) gp.AddLine(x + width, y + radius, x + width, y + height - (radius * 2)); // Line gp.AddArc(x + width - (radius * 2), y + height - (radius * 2), radius * 2, radius * 2, 0, 90); // Corner (Bottom Right) gp.AddLine(x + width - (radius * 2), y + height, x + radius, y + height); // Line gp.AddArc(x, y + height - (radius * 2), radius * 2, radius * 2, 90, 90); // Corner (Bottom Left) gp.AddLine(x, y + height - (radius * 2), x, y + radius); // Line gp.AddArc(x, y, radius * 2, radius * 2, 180, 90); // Corner (Top Left) gp.CloseFigure(); return gp; } private void DrawRoundRect(Graphics g, Pen p, Rectangle rect, float radius) { GraphicsPath gp = getRoundRect(rect.X, rect.Y, rect.Width, rect.Height, radius); g.DrawPath(p, gp); gp.Dispose(); } private void DrawRoundRect(Graphics g, Pen p, int x, int y, int width, int height, float radius) { GraphicsPath gp = getRoundRect(x, y, width, height, radius); g.DrawPath(p, gp); gp.Dispose(); } private void DrawRoundRect(Graphics g, Brush b, int x, int y, int width, int height, float radius) { GraphicsPath gp = getRoundRect(x, y, width, height, radius); g.FillPath(b, gp); gp.Dispose(); } private void DrawRoundRect(Graphics g, Brush b, Rectangle rect, float radius) { GraphicsPath gp = getRoundRect(rect.X, rect.Y, rect.Width, rect.Height, radius); g.FillPath(b, gp); gp.Dispose(); } #endregion } </code></pre> <p>Now for the ToolStripControlHost</p> <pre><code>public partial class ToolStripTextBoxOwnerDraw : ToolStripControlHost { private TextBoxOwnerDraw InnerTextBox { get { return Control as TextBoxOwnerDraw; } } public ToolStripTextBoxOwnerDraw() : base(new TextBoxOwnerDraw()) { } public TextBox ToolStripTextBox { get { return InnerTextBox.TextBox; } } public int CornerRadius { get { return InnerTextBox.CornerRadius; } set { InnerTextBox.CornerRadius = value; InnerTextBox.Invalidate(); } } public Color BorderColor { get { return InnerTextBox.BorderColor; } set { InnerTextBox.BorderColor = value; InnerTextBox.Invalidate(); } } public int BorderSize { get { return InnerTextBox.BorderSize; } set { InnerTextBox.BorderSize = value; InnerTextBox.Invalidate(); } } public override Size GetPreferredSize(Size constrainingSize) { return InnerTextBox.PrefSize; } } </code></pre> <p>Then When you want to use it, just add it to the tool bar:</p> <pre><code>ToolStripTextBoxOwnerDraw tBox = new ToolStripTextBoxOwnerDraw(); this.toolStripMain.Items.Add(tBox); </code></pre> <p>or however you want to add it. If you are in Visual Studio, the preview window supports rendering this Control.</p> <p>There is only one thing to remember, when accessing the TextBox with the actual text in it, its: </p> <pre><code>tBox.ToolStripTextBox.Text; </code></pre>
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