how to go to a widget at the top of the page

my panel is very long, and I have an FlowPanel for displaying error message at the top of the long panel, there is a "search" button at the bottom of the page, when user press "search", there is validation and if has error, the error is shown on the FlowPanel at the top of page, but the page will not automatically jump to the top of the page to let user see the error message, I try to use a focusPanel to surrounding the error message panel and use focusPanel.setFocus(true) but the page still cannot jump to the focusPanel at the top of the page, so any method I can do?

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