steps to reproduce

Run fiddle as desktop browser, then as mobile browser
http://zkfiddle.org/sample/2j734mo/3-LibraryProperty-nativebar-mobile

(use chrome emulation : iPad for mobile)

actual result

Desktop browser:
default (not set) : native bar
nativebar set to true : native bar
nativebar set to false : iScroll

Mobile browser:
default (not set) : iScroll
nativebar set to true : native bar
nativebar set to false : iScroll

expected result

Desktop browser:
default (not set) : native bar
nativebar set to true : native bar
nativebar set to false : iScroll

Mobile browser:
default (not set) : native bar
nativebar set to true : native bar
nativebar set to false : iScroll

debug info

root cause

Meshwidget choose !mobile as default value for nativebar since ZK-2489

Workaround

Set library property nativebar in zk.xml to false (even though it is the default value)