title: TabControl.DrawItem not firing on user painted TabControl
body: <p>Hey, I've been trying to paint my own TabControl to get rid of the 3D Shadow but I am not having much success. The DrawItem event isn't firing at the moment. Do I have to shoot it myself? How do I do that?</p>
  
  <p>Code:</p>
  
  <pre><code>namespace NCPad
  {
      public partial class NCE_TabControl : TabControl
      {
          Rectangle TabBoundary;
          RectangleF TabTextBoundary;
  
          public NCE_TabControl()
          {
              InitializeComponent();
              this.SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer, true);
              this.DrawMode = TabDrawMode.OwnerDrawFixed;
              this.Paint += new PaintEventHandler(this.OnPaint);
              this.DrawItem += new DrawItemEventHandler(this.OnDrawItem);
          }
  
          protected void OnPaint(object sender, PaintEventArgs e)
          {
              Graphics g = e.Graphics;
              g.FillRectangle(new SolidBrush(Color.Red), e.ClipRectangle);
          }
  
          protected void OnDrawItem(object sender, DrawItemEventArgs e)
          {
              Graphics g = e.Graphics;
              g.FillRectangle(new SolidBrush(Color.Blue), this.TabBoundary);
              MessageBox.Show("hi");
          }
  
          protected override void OnLayout(LayoutEventArgs levent)
          {
              base.OnLayout(levent);
  
              this.TabBoundary = this.GetTabRect(0);
              this.TabTextBoundary = (RectangleF)this.GetTabRect(0);
          }
      }
  }
  </code></pre>