title: How to add button to textbox?
body: <p>I'm trying to make a TextBox with a button on the right side.
  My code:</p>
  
  <pre><code>public partial class TextBoxButton : TextBox
  {
      [Category("Button")]
      [Description("Button in textbox")]
      public Button Button
      {
          get
          {
              return this.btn;
          }
          set
          {
              this.btn = value;
          }
      }
  
      protected override void OnCreateControl()
      {
          if (!this.Controls.Contains(this.btn))
          {
              this.Controls.Add(this.btn);
              this.btn.Dock = DockStyle.Right;
          }
  
          base.OnCreateControl();
      }
  }
  </code></pre>
  
  <p>Everytime when I start my appi and set some text or image in the button it's empty. Some ideas?</p>
  
  <p>Best regards.</p>