Implement Divider between the last item of the child and next Groupheader expandableListview

I have implemented expandablelistview in android app and also implemented divider in it.

I have one problem in not getting the divider between the last item of the child and next group header.

Following image is how I want :

But following is what I'm getting:

Here if you compare both images the divider between the CID and About Set is not coming how to implement that divider ?

Also the groupIndicator is not changing inspite of providing the xml in the groupindicator containing the item tag with 2 different images in android:state_expanded and android:state_empty.

But the property of android:state_expanded and android:state_empty doesn't appear.