r - Displaying multiple ggvis plots simultaneously? -

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i have 2 ggvis plots display side side in r (shiny). in server.r file, have 

vis %>% bind_shiny("plot1")   vis2 %>% bind_shiny("plot2")

both vis , vis2 work when displayed individually, not together. ui.r code display them 

column(6,div(class='span12',align="center",textoutput("title")),           ggvisoutput("plot1"),align=left),   column(6,div(class='span12',align="center",textoutput("title")),           ggvisoutput("plot2"),align=left)

when used together, can't show.


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