Android : expandable listview giving same values for all childs

I had displayed data obtained fron xml parsing in an expandable listview. After clicking ongroupclicklistener the childs of all the groups is diaplaying the same values. for E.g. if i click on group at position1, the child shows its values correctly., then collapsing that group and clicking on group at positon2 or 3 or any groups clicked later displays the values of first clicked child. where as i want to display different values for differnt childs. I had written the code these links XML Parsing and expandable listview.

please help me out