public static class ToolbarPluginExecutor.Button
Contains a definition of a single toolbar button. Currently you must either define
a concrete JSF action outcome in "action", or supply a EL-binding for "beans" and
The url of the icon to be displayed in the toolbar can be set via setIconUrl(String iconUrl)
Alternatively as shorthand, the icon can be set via setIcon(String iconName) which
is mapped to the url adm/images/toolbar/iconName.png.