ControllableItemEventHandlerTItem - делегат

public delegate void ControllableItemEventHandler<TItem>(
	Object sender,
	ControllableItemEventArgs<TItem> e
)
where TItem : class

Public Delegate Sub ControllableItemEventHandler(Of TItem As Class) ( 
	sender As Object,
	e As ControllableItemEventArgs(Of TItem)
)

generic<typename TItem>
where TItem : ref class
public delegate void ControllableItemEventHandler(
	Object^ sender, 
	ControllableItemEventArgs<TItem>^ e
)

type ControllableItemEventHandler = 
    delegate of 
        sender : Object * 
        e : ControllableItemEventArgs<'TItem> -> unit