Gets or sets how a gallery, when it's displayed within a dropdown window, can be resized. This is a dependency property.
A GallerySizeMode value that specifies how the current dropdown gallery can be resized.
A gallery can be displayed within a dropdown window. Use the SizeMode property to allow the dropdown gallery to be resized. If the SizeMode property is set to Both, the gallery can be resized both vertically and horizontally via the size grip displayed at the bottom of the dropdown window.