Dear! What I have to do is to remove on object on some event and appears another at the same time in the same place , for example, there are four objects on the screen Apple, Ball, Cat and Dog, Now when user Drag "A" to the Apple which is the right answer, Apple + A both removes which i did and "B" appears at the same position where was "A" in the start, and another object like "Monkey" appear where was "Apple" and same from A to Z.
screen shot is attached.
In image both A and B appears but I want to show B when A is removed.