protected override void OnPaint(PaintEventArgs e)
{
var g = e.Graphics;
using (var p = new Pen(Colours.DarkBorder))
{
g.DrawLine(p, ClientRectangle.Left, 0, ClientRectangle.Right, 0);
}
using (var p = new Pen(Colours.LightBorder))
{
g.DrawLine(p, ClientRectangle.Left, 1, ClientRectangle.Right, 1);
}
}