where to write submit action in VC app

Hi Frndz..

Am new to this VC, am trying to build an application that will invoke the 2nd iview from 1st iview, but the thing is i was unable to put submit action on my push button.....

i was selectd custom action from action tab, but where i need to write the code that invoke 2nd iview,n

wht about the validation i need some custion validations those will trigger when i click on submit button

Itz bit urgent for my futhur procedding ...

Thnaks in Advance..

Regards

Rajesh