How to click on a GUILayout.Button that is already created

Hi,

I have been trying for a while to make an Inventory System that will allow me to collect certain items and delete them from my inventory whenever I want by clicking on the name.

My code looks like this:

 static public Dictionary<int, string> InventoryNameDictionary = new Dictionary<int, string>()
         {
             {0, null},
             {1, null},
             {2, null},
             {3, null},
             {4, null},
             {5, null}
         };
 
     static public List<int> dictonaryAmounts = new List<int>()
     {
         0,
         0,
         0,
         0,
         0,
         0
     };
     void OnGUI()
         {
             inventoryToggle = GUI.Toggle(new Rect(50, 30, 150, 75), inventoryToggle, "Inventory");
     
             if(inventoryToggle)
             {
                 inventoryRect = GUI.Window(0, inventoryRect, inventoryMethod, "Inventory");
             }
         }
     
         void inventoryMethod(int windowId)
         {
             GUILayout.BeginArea(new Rect(5, 50, 400, 400));
     
             GUILayout.BeginHorizontal();
             GUILayout.Button(InventoryNameDictionary[0], GUILayout.Height(50));
             GUILayout.Box(dictonaryAmounts[0].ToString(), GUILayout.Height(50));
     
             GUILayout.Button(InventoryNameDictionary[1], GUILayout.Height(50));
             GUILayout.Box(dictonaryAmounts[1].ToString(), GUILayout.Height(50));
     
     
             GUILayout.Button(InventoryNameDictionary[2], GUILayout.Height(50));
             GUILayout.Box(dictonaryAmounts[2].ToString(), GUILayout.Height(50));
             GUILayout.EndHorizontal();
     
     
             GUILayout.BeginHorizontal();
             GUILayout.Button(InventoryNameDictionary[3], GUILayout.Height(50));
             GUILayout.Box(dictonaryAmounts[3].ToString(), GUILayout.Height(50));
     
             GUILayout.Button(InventoryNameDictionary[4], GUILayout.Height(50));
             GUILayout.Box(dictonaryAmounts[4].ToString(), GUILayout.Height(50));
     
             GUILayout.Button(InventoryNameDictionary[5], GUILayout.Height(50));
             GUILayout.Box(dictonaryAmounts[5].ToString(), GUILayout.Height(50));
     
             GUILayout.EndHorizontal();
             GUILayout.EndArea();
     
         }
 

As you can see, I created a Dictionary that will map my items to a certain position in the inventory. So in the inventory, there will be one button containing the name/icon of the item just collected and next to it a count of that specific item inside the inventory.

Whenever the user clicks on the name, I want the script to detect which button was clicked and subtract one from the count. The count is held by dictionaryAmount.

I tried to make event triggers, but they are not working right for this example.

I have been searching the web for hours trying to find a solution. Do you have any suggestions? If so, please let me know. Again, the question is if there is a way for me to detect which button was clicked.

PS: I used this as reference for the Inventory System: http://forum.unity3d.com/threads/inventory-tutorials.197096/