Creates a new GladeXML object (and the corresponding widgets) from the
XML file fname. Optionally it will only build the interface from the
widget node root (if it is not NULL). This feature is useful if you
only want to build say a toolbar or menu from the XML file, but not the
window it is embedded in. Note also that the XML parse tree is cached
to speed up creating another GladeXML object for the same file
Creates a new GladeXML object (and the corresponding widgets) from the XML file fname. Optionally it will only build the interface from the widget node root (if it is not NULL). This feature is useful if you only want to build say a toolbar or menu from the XML file, but not the window it is embedded in. Note also that the XML parse tree is cached to speed up creating another GladeXML object for the same file