I’m trying to using GWT 2.4 to make a widget just like below: a button, when clicking it can show a drop-down list under it. This picture is from Google’s new Blogger system.
Anyone could shed some light on this?

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You could use a
MenuBarwidget with a single menu item (being the button) having a submenu (the dropdown menu).Or you could use a
Button, and from within aClickHandleryou’d show aPopupPanelcontaining a verticalMenuBarrelative to the button (which you’d set as an auto-hide partner)