Change the back color of menu item on mouse leave

Your answer is much accurate. But, I've something more to do. Actually, On sub-menu Item I have created a rectangle with x as a representation of close button. So, I've changed that rectangle back color to blue (highlight) on mouseover. Now, I need to change that color to default(previous). How can I do this? Code is attached below:
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);

SolidBrush brush;
Rectangle r = new Rectangle(this.Bounds.Width - 20, 2, 16, 17);

// If click on Del(Close Icon)
if (bOnDel)
{
brush = new SolidBrush(Color.LightBlue);
e.Graphics.FillRectangle(brush, r);
brush.Color = Color.Blue;
e.Graphics.DrawRectangle(new Pen(brush, 1), r);
}
// If didn't click on Del(Close Icone)
if (!bOnDel)
{

brush = new SolidBrush(Color.FromKnownColor(KnownColor.Transparent));
e.Graphics.FillRectangle(brush, r);
brush.Color = Color.FromKnownColor(KnownColor.Transparent);
e.Graphics.DrawRectangle(new Pen(brush, 1), r);
}

//Code for Drawing Cross Lines

brush = new SolidBrush(Color.Gray);
Rectangle rCross = new Rectangle(this.Bounds.Width - 15, 8, 6, 6);
e.Graphics.DrawLine(new Pen(brush, 2), new Point(rCross.Right, rCross.Top), new Point(rCross.Left, rCross.Bottom));
e.Graphics.DrawLine(new Pen(brush, 2), new Point(rCross.Left, rCross.Top), new Point(rCross.Right, rCross.Bottom));
}