Android Question Expandable CustomListView question

hi

i have expandable clv. now i have a problem in expandable panel. i put there for example 1 label. when user tap on arrow to expand that panel, setting text to that label in that moment will not change text. so if u put "test" as text in that label you will not see new text which should be updated when user taps arrow icon to expand the panel. how to solve this?

thanks