Called when a ButtonItem is clicked on. @param handler the click handler @return {@link HandlerRegistration} used to remove this handler
Executed when this menu item is clicked by the user. The click handler must be specified as a function or string of script. Call {@link com.smartgwt.client.widgets.menu.events.MenuItemClickEvent#cancel()} from within {@link ClickHandler#onClick} to suppress the {@link com.smartgwt.client.widgets.menu.Menu#addItemClickHandler Menu.itemClick}handler if specified. @param handler the click handler @return {@link HandlerRegistration} used to remove this handler
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