Public Shared Function CreateBitmapSourceFromHIcon ( _
    icon As IntPtr, _
    sourceRect As Int32Rect, _
    sizeOptions As BitmapSizeOptions _
) As BitmapSource

Dim icon As IntPtr
Dim sourceRect As Int32Rect
Dim sizeOptions As BitmapSizeOptions
Dim returnValue As BitmapSource

returnValue = Imaging.CreateBitmapSourceFromHIcon(icon, _
    sourceRect, sizeOptions)

public static BitmapSource CreateBitmapSourceFromHIcon(
    IntPtr icon,
    Int32Rect sourceRect,
    BitmapSizeOptions sizeOptions
)

public:
static BitmapSource^ CreateBitmapSourceFromHIcon(
    IntPtr icon, 
    Int32Rect sourceRect, 
    BitmapSizeOptions^ sizeOptions
)

public static function CreateBitmapSourceFromHIcon(
    icon : IntPtr, 
    sourceRect : Int32Rect, 
    sizeOptions : BitmapSizeOptions
) : BitmapSource

You cannot use methods in XAML.