Public Function CanExecute( _
   ByVal parameter As Object _
) As Boolean

Dim instance As CommandReference
Dim parameter As Object
Dim value As Boolean
 
value = instance.CanExecute(parameter)

public bool CanExecute( 
   object parameter
)

public function CanExecute( 
    parameter: TObject
): Boolean; 

public function CanExecute( 
   parameter : Object
) : boolean;

public: bool CanExecute( 
   Object* parameter
) 

public:
bool CanExecute( 
   Object^ parameter
)