XElement delement = element.addElement( "dockables" );
for( DockableEntry entry : dockables ){
XElement xentry = delement.addElement( "entry" );
xentry.addString( "id", entry.id );
if( entry.current != null )
xentry.addString( "current", entry.current.toString() );
XElement xhistory = xentry.addElement( "history" );
for( Path history : entry.history ){
xhistory.addElement( "mode" ).setString( history.toString() );
}