i want to load all tabs data at starts so that ican perform check on internal forms ?
Which tabbar loading mode do you use: html (default) or ajax?
In the first case all data are available on the page after last call of setContent method.
If you use ajax mode, you should use setOnTabContentLoaded event handler which will be called when tab content are loaded from a server:
tabbar.setOnTabContentLoaded(function(tabId){
…
})