private void XnaPanelDragDrop(object sender, DragEventArgs e)
{
var enemy = (Enemy)e.Data.GetData(typeof(Enemy));
var sprite = new EnemySprite(enemy);
var p = this.xnaPanel.PointToClient(new Point(e.X, e.Y));
sprite.X = p.X - (sprite.Width / 2);
sprite.Y = p.Y - (sprite.Height / 2);
this.xnaPanel.AddSprite(sprite);
}