getReadableDatabase when our query is SELECT
use uniqueGroupLabel when inserting into db, rather than groupLabel
new layout with only one ExpandableListView in NavigationDrawerFragment
new layout for the Header in ExpandableListView
update groupLayout for expandableListView to have an ImageView to use it as expand/collapse indicator
update drawerActivity to include our new fragment with only one ExpandableListView
code behind class for our new DrawerFragment layout
helper function to combine all the productHeadGroups into a single list to send to our singleExpandableListViewAdapter, and a new flag isHeader to know if our group is header
update getGroupView in our ExpandableListViewAdapter
use new drawerFragment with only one ExpandableListView in our activity