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Blackberry Back Button in Phonegap no longer working when Sencha added
I've created a Sencha Touch App and I am using this with Phonegap to generate a Blackberry App.
I want to make use of the hardware back button, which is possible via BB Webworks and works, but only as long as I don't add Sencha Touch. It works fine when not using Sencha Touch, but the event seems not to be caught when Sencha Touch js-files are added.
Any clues why?