How can i set a lot width in flash professional / builder

i facing problem , not getting answer in google.

 

i using flash professional cs6

 

i making  running game action-script 3 hero pass obstacle set in stage (it not come though loop). hero run , proceed obstacle end reach best time. game end in fixed place.

problem need huge stage.width create game. in flash highest width `8120 pixle have tried other thing centimeter, inches etc .but same.

so how can set width need , on flash software have use ??

stage width limited in cs6. flash pro cc removed width restrictions. use animate cc.

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