Public Sub PrintVisual ( _
    visual As Visual, _
    description As String _
)

Dim instance As PrintDialog
Dim visual As Visual
Dim description As String

instance.PrintVisual(visual, description)

public void PrintVisual(
    Visual visual,
    string description
)

public:
void PrintVisual(
    Visual^ visual, 
    String^ description
)

public function PrintVisual(
    visual : Visual, 
    description : String
)

You cannot use methods in XAML.