void OnMouseDown()
{
int cost = Button.selectedPrefab.GetComponent <Defender> ().cost;
if (starDisplay.UseStar(cost) == status.success)
{
GameObject newDefender;
newDefender = Instantiate(Button.selectedPrefab, CalculateWorldPointOnMouseClick(), Quaternion.identity) as GameObject;
newDefender.transform.parent = defenderParent.transform;
}
else
{
starDisplay.FlashRed();
}
}