控制边框在C＃中的窗体中闪烁

Question

在我的自定义控制文件中：

namespace myApp {
    public partial class MyStatusBar : Label {

      public MyStatusBar () {
          InitializeComponent ();
          this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
          this.Dock = DockStyle.Bottom;
      }

      protected override void OnPaint (PaintEventArgs pe) {
          base.OnPaint (pe);
          pe.Graphics.DrawRectangle (new Pen (Color.Azure), ClientRectangle);         
      }
    }
}

以我的形式：

MyStatusBar mStatusBarLabel = new MyStatusBar ();

public MCADDrg() {
     InitializeComponent ();

     this.SetStyle (ControlStyles.OptimizedDoubleBuffer, true);
     this.SetStyle (ControlStyles.AllPaintingInWmPaint, true);
     this.SetStyle (ControlStyles.UserPaint, true);
     this.SetStyle (ControlStyles.SupportsTransparentBackColor, false);
     this.SetStyle (ControlStyles.Opaque, false);
     this.SetStyle (ControlStyles.OptimizedDoubleBuffer, true);
     this.SetStyle (ControlStyles.ResizeRedraw, true);

     splitContainer1.Panel2.Controls.Add (mStatusBarLabel);   
     splitContainer1.Panel2.MouseMove += Panel2_MouseMove;
}

void Panel2_MouseMove (object sender, MouseEventArgs e) {
    if( splitContainer1.Panel2.ClientRectangle.Contains(e.Location))
        mStatusBarLabel.Text = "X = " + e.X + " Y = " + e.Y;
    }
}

我怎样摆脱这个？我试了一些其他帖子的答案。但是对我来说没有用。假设（实际上）我是新手。