How do you get all of the dragon balls in dragonballz budokai tenkaichi 3

when in dragon history mode, smash rocks and things, u should find dragon balls keep smashing rocks in history mode until you find all seven then when in main menu go down until you see the word [shenron] and go in it and get that wish of yours granted note:it will not work in certain places and you can go back in the stage that you were in and find more dragonballs note:only one per time you can not find 2 in 1 level oh my goodness ive gone cross eyed and u must go to cell saga last battle and there u always find a dragonball