I can not be able to get gwt visualization charts(LineChart & ColumnChart) in History

Hi all,

I am using google visualization LineChart and ColumnChart to
show chart for dynamic values in a page. And I added those charts to a
HorizontalPanel.
I am providing a button to show the values which are caused
for that chart. I am adding those values to the another
HorizontalPanel, adding that HorizontalPanel to the RootPanel and I am
maintaing the previous HorizontalPanel which is have charts in
History.
And now I am providing one more button to go back to see
charts. When clicked on that button I am showing the HorizontalPanel
which is in History and that HorizontalPanel is allocating the space
but charts are not visible.
I checked that by inspecting the view with firebug. It is
showing the body empty.
But remaining all Label and Buttons are visible

Can anybody suggest the solution for this problem.

Thanks,
vara kumar

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