Blackberry:lock application in portrait mode?

I want to start my application in portrait mode, always, on a BlackBerry Storm, even then when device is in landscape mode.

How cou开发者_Python百科ld I do that?

I know we can control the orientation after opening my app, by:

UiEngineInstance ui = Ui.getUiEngineInstance();
ui.setAcceptableDirections(Display.DIRECTION_NORTH); 

but how to open the app in portrait mode?

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Use following just one line of code in constructor of each screen class.

Ui.getUiEngineInstance().setAcceptableDirections(Display.DIRECTION_PORTRAIT);

I also get the problem with this in OS 7 phone, So I have fixed by issue with using below code:

Ui.getUiEngineInstance().setAcceptableDirections(Display.DIRECTION_NORTH);