public Pixbuf GetIcon(Icons.Icon icon, IconSize size)
{
Pixbuf pb;
string iconKey = icon.Name + (int)size;
if (iconCache.TryGetValue(iconKey, out pb))
return pb;
pb = icon.Render(widget, size);
if (pb == null)
return null;
iconCache.Add(iconKey, pb);
//Debug.WriteLine(string.Format("IconCache: cached icon \"{0}\" (size = {1})", icon.Name, IconUtils.GetIconSizeVal(size)));
return pb;
}