[DCC Error] CustomSchedulerEditor.pas(129): E2137 Method 'ApplyChanges' not found in base class

Hi Paulo,
It seems DevExpress has made a lot more changes that are not mentioned in the Breaking Changes.
function of procedure "DeleteEvent" does not exist anymore or is moved.
Global variable FModified does not exist anymore.
- related to: https://www.devexpress.com/Support/Center/Question/Details/Q557893
I've tried to setup my customEventEditor as you suggested. Can you please check if this is done correctly?
Can you please make a suggestion on how to solve the missing DeleteEvent?
===================================================================
procedure TMycxSchedulerEventStandardEditorFormHelper.Cancel(var AModalResult: TModalResult);
// Onderdeel van TMycxSchedulerEventStandardEditorFormHelper
begin
  inherited;
  case AModalResult of
    mrCancel: begin
                If NieuweAfspraakRelatie then
                  Event.Delete
                else
                  Event.Cancel;
                Modified := False;
                Storage.FullRefresh;
              end;
  end;
  NieuweAfspraakRelatie := False;
end;
procedure TMycxSchedulerEventStandardEditorFormHelper.Close(var AModalResult: TModalResult);
// Onderdeel van TMycxSchedulerEventStandardEditorFormHelper
begin
  inherited;
  case AModalResult of
    mrAbort: DeleteEvent;
  end;
  NieuweAfspraakRelatie := False;
end;
procedure TMycxSchedulerEventStandardEditorFormHelper.Delete(var AModalResult: TModalResult);
// Onderdeel van TMycxSchedulerEventStandardEditorFormHelper
begin
  inherited;
  NieuweAfspraakRelatie := False;
end;
procedure TMycxSchedulerEventStandardEditorFormHelper.Save(var AModalResult: TModalResult);
// Onderdeel van TMycxSchedulerEventStandardEditorFormHelper
begin
  inherited;
  case AModalResult of
    mrOk: SaveChanges;
  end;
  NieuweAfspraakRelatie := False;
end;

Hello,
You can use the helper's Delete method instead of the DeleteEvent one:

Delphi
procedure TMycxSchedulerEventStandardEditorFormHelper.Cancel(  
  var AModalResult: TModalResult);  
begin  
  inherited;  
  AModalResult := mrAbort;  
  Delete(AModalResult);  
end;  

In fact, the FModified parameter is not necessary anymore because forms are not modal now. Anyway, you can use the solution from the 13.2 Breaking Change ticket instead.
As for your code, I am afraid I do not understand its purpose. Would you please describe how it should work and we will do our best to find a solution for you? It would be extremely helpful if you describe your logic based on the application I attached in my answer.

Probably it is easier to explain what I try to accomplish based on the old code.
procedure TcxSchedulerEventEditorCustomized.ApplyChanges;
begin
  case ModalResult of
    mrAbort: // If a new event is created and the eventeditor-form is closed (with X), then event is removed.
      DeleteEvent;
    mrOk: // OK-button is pressed: Either new or changed event is saved
      SaveChanges;
    mrCancel: // Cancel-button is pressed
      begin
        If NieuweAfspraakRelatie then // flag to mark event as new
          Event.Delete // if it is a new event, then it is removed
        else
          Event.Cancel; // if it is an existing event, then changes are aborted
        FModified := False;
        Storage.FullRefresh;
      end;
  end;
  NieuweAfspraakRelatie := False; // Eventeditor dialog is closed, so flag to mark event as new is reset.
end;
What would be a good approach to set this up with 2013.2.2?