Subform add Instance problem

G'day

I'm very new to LiveCycle and teaching myself to create forms

I have a drop down box in a subform requesting information. Depending on the information required certain text boxes will appear (using switch case script) dateFrom dateTo dateCourt txtOther

When I add a new instance of this subform the list appears correctly in the drop down box but when the item is selected the text boxes do not appear at all.

I am probably missing something fundamental. Any ideas

Cheers

//cboInfoRequired

RFI.InfoRequested.Info.cboInfoRequired::exit - (JavaScript, client)

switch(RFI.InfoRequested.Info.cboInfoRequired.rawValue){

  case "Info A":

  RFI.InfoRequested.Info.dateFrom.presence = "visible";

  RFI.InfoRequested.Info.dateTo.presence = "visible";

  RFI.InfoRequested.Info.dateCourt.presence = "hidden";

  RFI.InfoRequested.Info.txtOther.presence = "hidden";

  break;

  case "Info B":

  RFI.InfoRequested.Info.dateFrom.presence = "hidden";

  RFI.InfoRequested.Info.dateTo.presence = "hidden";

  RFI.InfoRequested.Info.dateCourt.presence = "visible";

  RFI.InfoRequested.Info.txtOther.presence = "hidden";

  break;

  case "Info C":

  RFI.InfoRequested.Info.dateFrom.presence = "hidden";

  RFI.InfoRequested.Info.dateTo.presence = "hidden";

  RFI.InfoRequested.Info.dateCourt.presence = "hidden";

  RFI.InfoRequested.Info.txtOther.presence = "visible";

  break;

  case "Info D":

  RFI.InfoRequested.Info.dateFrom.presence = "hidden";

  RFI.InfoRequested.Info.dateTo.presence = "hidden";

  RFI.InfoRequested.Info.dateCourt.presence = "hidden";

  RFI.InfoRequested.Info.txtOther.presence = "hidden";

  break;

  }

//cmdAdd

RFI.InfoRequested.AddInfo.cmdAdd::click - (JavaScript, client)

RFI.InfoRequested.Info.instanceManager.addInstance(1);