Public Property CustomSort As IComparer

Dim instance As ListCollectionView
Dim value As IComparer

value = instance.CustomSort

instance.CustomSort = value

public IComparer CustomSort { get; set; }

public:
property IComparer^ CustomSort {
    IComparer^ get ();
    void set (IComparer^ value);
}

public function get CustomSort () : IComparer
public function set CustomSort (value : IComparer)

You cannot set this property in XAML.