How to add tool bar( pagination) to custom Viewer Servlet in birt report

How to add tool bar( pagination) to custom Viewer Servlet in birt report

I am a java developer. Working on birt report. I facing problem with that.
I need a report, where resultset will be provided from j2ee application(
as sql query includes dynamic table name according to condition) as well
as display column will be dynamic depending upon choice of user(suppose,
user1 choose col1,col3,col5 and user2 choose col1,col2,col3,col4,col5) in
report generation. My solution 1) Create custom ViewerServlet 2) pass
resultset do the needful. I have implemented first approach but can not
incorporate tool bar(pagination, export etc.).Please give me an idea to
add tool bar in my custom viewer servlet. No solution for 2nd approach. I
got
"techieocean.blogspot.in/2009/06/how-to-pass-resultset-to-birt-report.html"
in web but need in brief to do this. Please help me.