on going fixes. For ie10 use -ms-flex: 1 1 instead of -ms-flex: 1 since
ie10 sets shrink to 0 by default if not specified whereas webkit sets it
to 1. Do not do event.preventDefault in the CellList if we are running
on windows phone, prevents the scroll panel the CellList is in scrolling
properly.
for ie10/ie11 desktop needed to add a focus fix where when using pointer
capture, input elements failed to get the focus properly. See
https://stackoverflow.com/questions/27355271/desktop-ie10-ie11-on-windows-input-elements-fail-to-get-focus-when-pointer-cap