Method can't execute while animation.
It is because while executing following method,
generating the change in the property of MultiScaleSubImage such as LayoutChanged,
the layout might collapse for secondarily.
But while executing following method,
ZoomIn/ZoomOut, Next/Previous : generating the change in the property of MultiScaleImage,
I think there is no influence if another method is executed.
Please try following.
Released not to be able to call other methods
at method of ZoomIn/ZoomOut and Next/Previous.
# L540 (Next method), L554 (Previous method)
comment out "isTweening = true".
# L400 (Zoom method)
comment out "isZooming = true".