public TextBoxButton()

         {

             _button = new Button

             {

                 ForeColor = System.Drawing.SystemColors.GrayText,

                 Name = "button1",

                 Padding = new System.Windows.Forms.Padding(, , , ),

                 Text = "…",

                 UseVisualStyleBackColor = true,

                 Size = new System.Drawing.Size(, ),

                 Dock = DockStyle.Right

             };

             this._button.SizeChanged += (o, e) => OnResize(e);

             this._button.MouseMove += (o, e) => { this.Cursor = Cursors.Default; };

             this.Controls.Add(_button);

         }

         protected override void OnResize(EventArgs e)

         {

             base.OnResize(e);

             _button.Size = new Size(_button.Width, this.ClientSize.Height + );

             _button.Location = new Point(this.ClientSize.Width - _button.Width, -);

             // Send EM_SETMARGINS to prevent text from disappearing underneath the button

             SendMessage(this.Handle, 0xd3, (IntPtr), (IntPtr)(_button.Width << ));

         }