Public Function ContainerFromItem ( _
    item As Object _
) As DependencyObject

Dim instance As ItemContainerGenerator
Dim item As Object
Dim returnValue As DependencyObject

returnValue = instance.ContainerFromItem(item)

public DependencyObject ContainerFromItem(
    Object item
)

public:
DependencyObject^ ContainerFromItem(
    Object^ item
)

public function ContainerFromItem(
    item : Object
) : DependencyObject

You cannot use methods in XAML.