We used the same example to test, but we couldn't reproduce your issue on our end.
In order to break inside the onDeviceReady() handler you must put the breakpoints and hit the Refresh (not the Reload) button of the Simulator. Breakpoints inside the other functions, triggered by user actions, work as expected.
We'd be really grateful, if you could provide us with a short video illustrating your issue.
Kristian D. Dimitrov
the Telerik team
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