question: returns a single instance of this class concode_field_sep List<ContextMenuFactorySPI> factoryList concode_elem_sep Set<ContextMenuListener> listeners concode_elem_sep ContextMenuManager manager concode_field_sep void removeContextMenuListener concode_elem_sep void fireContextMenuEvent concode_elem_sep List<ContextMenuFactorySPI> getContextMenuFactoryList concode_elem_sep void addContextMenuListener
target: ContextMenuManager function ( ) { return ContextMenuManagerHolder . manager ; }