Image doesn't change in child activity using Activitygroup in android

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http://stackoverflow.com – In my app, I' using Tab. There are three tabs. In which 3rd tab is Activity group which has two activities. In first activity, there are two options for user. User can choose image from camera or from gallery. After selecting an image, user should move to child activity, which will display selected image in that activity. Till this app is working fine. But only problem here I'm facing is, image is not being cleared when I move back to parent activity from child activity. Means once I choose image from gallery/camera, user moves to child activity, and image is being displayed in child activity. (HowTos)