If you view the activity of the navigation box with uiautomatorviewer, you may notice that the menu button of the navigation box is the first ImageButton. Thus, you can call up the menu and click on the first element:
solo.clickOnImageButton(0);// open the menu solo.sendKey(KeyEvent.KEYCODE_DPAD_DOWN);// select the first item solo.sendKey(KeyEvent.KEYCODE_DPAD_CENTER);// click the first item
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