Qml update Test by DevelpmentSupport Class in BlackBerry Cascades 10.2 SDK and with the Momentics IDE 2.0
Don't forget to check "Send QML files to device"
Window > Preferences > BlackBerry, select Send QML files to device on save.
For more information, please check the website.
https://developer.blackberry.com/native/reference/cascades/bb__cascades__developmentsupport.html