public void SetParentTile(WorldTile parent)
{
Assert.IsNull <WorldTile>(_parentTile, "Tried to set another parent: " + _col + "x" + _row);
Assert.IsTrue(parent != this, "Tried to set parent to ourself: " + _col + "x" + _row);
_parentTile = parent;
_parentTile.AddChildTile(this);
}