protected override void TileDrawer(int index, Cairo.Context cr)
{
base.TileDrawer(index, cr);
int x = index % Width;
int y = index / Width;
cr.Save();
if (GetSelected(x, y))
{
cr.SetSourceRGB(1.0, 0, 0);
//cr.Rectangle(0, 0, TileWidth, TileHeight);
cr.PaintWithAlpha(0.4);
CairoHelper.DrawRectOutline(cr, 1, new Cairo.Rectangle(0, 0, TileWidth, TileHeight));
}
cr.Restore();
}