plugins 3.0 : pagenumber , pagepos ?

Hello

I migrate a plugins from MuseScore.2 to MusScore.3.
I have an issue to retrieve in MuseScore.3 the properties available in MuseScore.2 : pagenumber ans pagePos

• pagenumber
  I need the pagenumber of a cursor.
  In MuseScore.2 it is cursor.measure.parent.parent.pagenumber. works fine.
  In MuseScore.3 , I can't find this property, nor inspect cursor.measure.parent.parent (crash)
  function logInspect(o, oname) {
  console.log("object " + oname + " <" + o.objectName + ">" );
  for(var p in o){
  var t=typeof o[p];
  console.log(" " + p + " / " + t )
  }
  cursor.rewind(0);
  logInspect(cursor.measure.parent, "cursor.measure.parent"): => OK contains parent
  logInspect(cursor.measure.parent.parent, "cursor.measure.parent.parent"): => crash

• pagepos
  I need the absolute position of a note in the page.
  In MuseScore.2 : mnote= cursor.element.note[0] . mnote.pagePos.x , mnote.pagePos.y , mnote.bbox.width , mnote.bbox.height
  In MuseScore.3 , pagePos disappears...

• dolayout
  For info : I understand that score.doLayout() is replaced by a score.startCmd() ... score.endCmd()

Thank you for your support
Franck Revolle