Themes: reorganized setInitializers() function to be more understandable for new users by grouping initializers for sub-components with the main component
PopUpManager: added IPopUpManager interface and created DefaultPopUpManager. PopUpManager now delegates calls to a static instance of DefaultPopUpManager. (references #551)
MetalWorksMobileTheme: proper disabled color on ButtonGroup buttons
ButtonGroup: can be disabled and reenabled (closes #781)
ButtonGroup: properly updates event listeners from DEFAULT_BUTTON_EVENTS when data provider changes (closes #735)