xenadmin/XenAdmin/Controls/HelpButton.cs

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

namespace XenAdmin.Controls
{
    public partial class HelpButton : PictureBox
    {
        Image HoverImage;
        Image NormalImage;

        public HelpButton()
        {
            InitializeComponent();
        }

        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);

            NormalImage =
                Width == 24 ? Images.StaticImages.help_24 :
                Width == 32 ? Images.StaticImages._000_HelpIM_h32bit_32 :
                              Images.StaticImages._000_HelpIM_h32bit_16;
            HoverImage =
                Width == 24 ? Images.StaticImages.help_24_hover :
                Width == 32 ? Images.StaticImages.help_32_hover :
                              Images.StaticImages.help_16_hover;

            Image = NormalImage;
        }

        protected override void OnMouseEnter(EventArgs e)
        {
            Image = HoverImage;
            base.OnMouseEnter(e);
        }

        protected override void OnMouseLeave(EventArgs e)
        {
            Image = NormalImage;
            base.OnMouseLeave(e);
        }
    }
}