is there a way to get the slot when i highlight it in the inventory?

Highlighted items are most likely only client-side. The next best thing you can do is determine which item the player has selected in their hotbar.

trying to detect when click a ware item.... so when you click an item it gets the item name from somewhere cause if is custome item the names is displayed but i do not know where that is to try and hook it.

Merged post

ItemIcon has
public virtual void OnPointerClick(PointerEventData eventData)
{
}
but i seem to get 
Error in creating source code from IL: Failed to resolve assembly: 'UnityEngine.CoreModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'