Are you setting the correct dropdown items ?:
getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
navigationItems = Arrays.asList(getResources().getStringArray(R.array.navigation_array));
setupNavigationStrings();
navigationAdapter = new ArrayAdapter<String>(context, com.actionbarsherlock.R.layout.sherlock_spinner_item, navigationItems);
navigationAdapter.setDropDownViewResource(com.actionbarsherlock.R.layout.sherlock_spinner_dropdown_item);
getSupportActionBar().setListNavigationCallbacks(navigationAdapter, this);
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