Check this out:http://www.java2s.com/Code/Java/GWT/
TableMouseOverEvent.htm
they have a mouseover event handling that could help you.

On Sep 24, 3:15 pm, mornindew <[email protected]> wrote:
> Hi all,
>      I am very new to GWT and I have a question that I cannot seem to
> wrap my head around.  I have a custom widget called MenuBarPanel.
> This will contain all of the menu actions that I need.  When a user
> selects the menubar I need it to call an action and reload only one
> panel (Custom panel called Content Panel) from my page.  Is there a
> way to make my menubar action (Command) reload only one panel from my
> entry page?  I hope I explained my issue clearly enough, like I said I
> am new to GWT.  Below is my current code for building my menubar.
>
> Thanks, Craig
>
>   public MenuBarPanel() {
>
>           Command command = new Command() {
>       public void execute() {
>           fileCommand();
>         }
>       };
>
>           MenuBar widget = new MenuBar();
>           widget.addStyleName("MenuBar");
>           widget.addItem("Home",command);
>           widget.addItem("Site Index",command);
>           widget.addItem("Search",command);
>           widget.addItem("Contacts",command);
>           widget.addItem("FAQ",command);
>           widget.addItem("Help",command);
>
>           initWidget(widget);
>
>   }
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