Hey thanks for clearing all my doubts for my problem.
Yes and also thanks for giving the response after marking is as solution.
As actually I am new and as the requirement came faster then I can search through or can have a full idea of blackberry UI working scenario, I didn't get time to search through properly or to clear its concept.
And both peter_strange and arkadyz had given lots of idea. So thanks both of you for guiding me in a right direction.