关于用PictureBox自定义Button控件，代码没有按我想的执行！求解！谢谢

[benbenRH]

用picturebox写的一个按钮控件，为什么鼠标离开的时候，有时候是变回 SystemColors .ButtonFace ;颜色（正常），有时候却鼠标离开后还是Color.White 呢？ 费解！请高手指点迷津！谢谢
public partial class ImageButton : System .Windows .Forms .PictureBox
{

private Color _mouseOnBackColor =Color.White ;
private Color _BackColor = SystemColors .ButtonFace ;
private Color _mouseDownBackColor = Color.SkyBlue ;

public ImageButton()
{
InitializeComponent();
this.MouseEnter += new EventHandler(ImageButton_MouseEnter);
this.MouseDown += new MouseEventHandler(ImageButton_MouseDown);
this.MouseUp += new MouseEventHandler(ImageButton_MouseUp);
this.MouseLeave += new EventHandler(ImageButton_MouseLeave);
this.Size = new Size(25, 25);

}

void ImageButton_MouseLeave(object sender, EventArgs e)
{
this.BackColor = backColorMouseOut;
this.BorderStyle = BorderStyle.None;
}

void ImageButton_MouseUp(object sender, MouseEventArgs e)
{
this.BackColor = backColorMouseOn;
this.BorderStyle = BorderStyle.FixedSingle;
}

void ImageButton_MouseDown(object sender, MouseEventArgs e)
{
this.BackColor = backColorMouseDown;
this.BorderStyle = BorderStyle.FixedSingle;
}

void ImageButton_MouseEnter(object sender, EventArgs e)
{
this.BackColor = backColorMouseOn;
this.BorderStyle = BorderStyle.FixedSingle;
}

[Description("按钮背景颜色"), Category("Appearance")]
public Color backColorMouseOut
{
get { return _BackColor; }
set { _BackColor = value; }
}

[Description("鼠标在按钮上面时的背景颜色"), Category("Appearance")]
public Color backColorMouseOn
{
get { return _mouseOnBackColor; }
set { _mouseOnBackColor = value; }
}

[Description("鼠标在按钮上按下时的背景颜色"), Category("Appearance")]
public Color backColorMouseDown
{
get { return _mouseDownBackColor; }
set { _mouseDownBackColor = value; }
}


}

[wartim]

因为有时你移开太快没有来得及刷新的关系

            void ImageButton_MouseLeave(object sender, EventArgs e)
            {
                this.BackColor = backColorMouseOut;
                this.BorderStyle = BorderStyle.None;

                this.Invalidate(); // 刷新一下
            }

[benbenRH]

还是一样，我移开的很慢也是一样！

[benbenRH]

我把

this.MouseEnter += new EventHandler(ImageButton_MouseEnter)；


去掉，就可以，可能是因为MouseEnter和MouseLeave工作的不是很顺利，请问怎么解决！谢谢