Inventory GUI

Hello,

I am trying to create an inventory system and GUI using UnityGUI.

So far I have an array of invetory Items witch contains GUIContent objects with a texture and name of each object. I first tried to use a SelectionGrid but that didn't display the correct selection and I was trying to make it functionate so if I left click on a button I consume the item and if I right click on the item I drop it.

I am now trying to do this by creating first a group and in side of it having smaller groups in which I display the texture and the text. I save the smaller groups rectangles and try to use those to check if I click inside them, but the clicks don't register correctly, I initially don't get anything and then I receive a bunch of random click messages.

The following code is what I use to display the gui and check for clicks, this is called in an OnGUI() function.

 public void drawInventoryGUI(int windowId)
     {
         GUI.FocusWindow(windowId);
         GUI.BeginGroup(new Rect(windowPosition.x,windowPosition.y,windowSize.x,windowSize.y));
         
         if(!checkNoInventory()){
             scroll = GUI.BeginScrollView(new Rect(scrollPosition.x,scrollPosition.y,scrollSize.x,scrollSize.y),scroll,new Rect(0,0,scrollSize.x,enlargeFactorScrollEquipment * inventoryItem.Length/xGrid));
             //clickedItem = GUI.SelectionGrid(new Rect(gridPosition.x,gridPosition.y,gridSize.x,enlargeFactorGridEquipment * inventoryItem.Length/xGrid),clickedItem,inventoryItem,xGrid);
             drawRectGUI();
             GUI.EndScrollView();
         }
         
         
         
         GUI.EndGroup();
         
     }
     
     private void drawRectGUI()
     {
         buttonPosition = new Rect[inventoryItem.Length];
         int i=0;
         int j=0;
         GUI.BeginGroup(new Rect(gridPosition.x,gridPosition.y,gridSize.x,enlargeFactorGridEquipment * inventoryItem.Length/xGrid));
         foreach(GUIContent item in inventoryItem)
         {
             if(i%5 == 0) 
             {
                 j++;
                 i = 0;
             }
             buttonPosition[i] = new Rect(i*100,j*100,60,90);
             GUI.BeginGroup(buttonPosition[i]);
             GUI.DrawTexture(new Rect(0,0,50,50),item.image);
             GUI.Label(new Rect(0,55,50,10),item.text);
             GUI.EndGroup();
             //Debug.Log(buttonPosition[i].ToString());
             i++;
         }
         GUI.EndGroup();
         
         for(int k=0 ; k< buttonPosition.Length ; k++)
         {
             
             if(Event.current.isMouse && buttonPosition[k].Contains(Event.current.mousePosition))
             {
                 Debug.Log("Clicked on button " + k);
             }
         }
     }

Does anybody have any idea on how to do it?