public void DisplayMana()
 {
     if (waveManager == null)
     {
         waveManager = GameController.instance.waveManager;
     }
     skillBook.GetComponentInChildren <Text>().text = waveManager.Mana.ToString();
 }
 public void HideDisplayWaveReward()
 {
     if (waveManager == null)
     {
         waveManager = GameController.instance.waveManager;
     }
     waveManager.SpawnWaveImmediate();
     waveManager.Mana += int.Parse(waveReward.GetComponentInChildren <Text>().text);
     AlertDisplay("+ " + waveReward.GetComponentInChildren <Text>().text + " Mana");
     waveReward.SetActive(false);
     waveInfoBtn.SetActive(false);
     countingDown = false;
 }