Restrict the touch screen direction

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Import the following classes:
- net.rim.device.api.ui.Ui
- net.rim.device.api.ui.UiEngineInstance

Invoke net.rim.device.api.ui.Ui.getUiEngineInstance().

UiEngineInstance _ue;
_ue = Ui.getUiEngineInstance();

Invoke net.rim.device.api.ui.UiEngineInstance.setAcceptableDirections(byte flags) and pass the argument for the direction of the Screen.
```
_ue.setAcceptableDirections(Display.DIRECTION_WEST);
```

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