corona group move

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-- main.lua
--
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local myGroup = display.newGroup()

local myBox = display.newRect( 100, 100, 80, 80 )
myBox:setFillColor( 1, 0, 0, 0.8 )
myGroup:insert( myBox )
myGroup.x = 50
myGroup.y = 50
local actualBoxX, actualBoxY = myBox:localToContent( 0,0 )
print( actualBoxX, actualBoxY )