Component Image disabled after a spawn

Hello,

I'm trying to buid animated panels on UI. The method i've choosen maybe is not the best one ( and not the best optimized too ) The two screen shots will explain better than i can do with words what is the problem.

I spawn images, then destroy them and respawn again. But as you can see on the second screenshot, the image component is disabled when it comes to the second spawn. And I can't find what i'm doing wrong in the code.

Thanks in advance for any help.

Here is my code.

     private void Start ()
     {
         SpawnLights();
     }
 
     private void Update ()
     {
         if (Time.time > nextSpawnTime ) 
         {
             nextSpawnTime += period;
             DestroyLights();
             SpawnLights();
         }
     }
 
     private void SpawnLights ()
     {    
         for (int i = 0; i < spawnCount; i++) 
             {    
                 column++;
                 if (column > panelSizeX) 
                 {    
                     column = 1;
                     raw++;
                 }
                 offset = new Vector3 ((cellSize / 2) * column + (cellSize / 2) * (column - 1), (cellSize / 2) * raw + (cellSize / 2) * (raw - 1), 0);
                 if (Random.value >= 0.5) 
                 {
                     spawn = true;
                 } else 
                 {
                     spawn = false;
                 }
                 if (spawn) 
                 {            
                     square = Instantiate (square, panelContainer.transform.position + offset, panelContainer.transform.rotation) as Image;
                     square.transform.SetParent (panelContainer.transform, true);
                 }
             }
     }
 
 
     private void DestroyLights ()
     {
         foreach (Transform child in panelContainer) 
         {
             column = 0;
             raw = 1;
             GameObject.Destroy(child.gameObject);
         }
     }
 }