xenadmin/XenAdmin/Controls/PanelWithBorder.cs

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using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace XenAdmin.Controls
{
    /// <summary>
    /// A panel with a one-pixel rectangular border round it. By default,
    /// the border is a suitable OS-dependent colour for using on the tab pages.
    /// </summary>
    class PanelWithBorder : Panel
    {
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public Color BorderColor { get; set; } = Color.DarkGray;

        public PanelWithBorder()
        {
            SetStyle(ControlStyles.DoubleBuffer | ControlStyles.Opaque, true);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            using (var pen = new Pen(BorderColor))
                e.Graphics.DrawRectangle(pen, 0, 0, Width - 1, Height - 1);
        }
    }
}