displayGroup tweaking

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-- DIPLAYGROUP TWEAKING TOGETHER WITH [SK]RAY
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local myGroup = display.newGroup()

local ball1 = display.newImageRect ( "ball.png" )
myGroup:insert( 1, ball1 )

local ball2 = display.newImageRect ( "ball.png" )
myGroup:insert( 1, ball2 )

local ball3 = display.newImageRect ( "ball.png" )
myGroup:insert( 1, ball3 )

myGroup:remove( ball2 ) -- NOW THE BALL AT PLACE 2 IN THE STACK IS REMOVES ITS 2 LEFT
myGroup:insert(2, ball2 ) --[[ THOUGHT WE NOW HAVE BALL2 IN PLACE 2 OF THE STACK AND BALL3 WAS MOVED UP TO PLACE 3--]]