The method is called by the collection when setting an item.
            
    Namespace: 
   SGP.Baltie2DAssembly: SGPRTL (in SGPRTL.dll)
Version: 1.2.3019.18825
Syntax
Parameters
- index
 - Type: System..::.Int32
Position in the collection where the item will be set. 
- oldValue
 - Type: System..::.Object
Item being removed. 
- newValue
 - Type: System..::.Object
Item being newly inserted.