extjs - Remove back button Sencha Touch 2 -

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i using sencha touch 2 build application. loading navigation view in view port , pushing login view. after login takes main page. here have button, when clicked goes login page. how can prevent this? googled lot not find effective answer. appreciated.

my first attempt add login view directly ext.viewport instead of pushing navigationview. then, once login process completed, have destroy login view can add navigationview viewport.

this way login view wont in navigationview stack.

hope helps-


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