void OnDropDown()
{
score.GetComponent <ScoreBehaviour>().AddToTetromiones(1);
// Clear filled horizontal lines
GridBehavior.DeleteFullRows();
// Spawn next Group
foreach (Transform child in transform)
{
child.transform.gameObject.layer = LayerMask.NameToLayer("LockedBlock");
}
Destroy(GameObject.FindGameObjectWithTag("CurrentShadow"));
FindObjectOfType <Spawner>().SpawnNext();
FindObjectOfType <Spawner>().lockHold = false;
}