How can I access Simulink/Stateflow chartFileNumber from within a Matlab function?

A typical Simulink model file (mdl) with a Stateflow chart looks something like

[..]
Stateflow {
  machine {
    [..]
  }
  chart {
    [..]
    chartFileNumber      1
    [..]
  }
[..]
}

The contained Stateflow charts have a chartFileNumber property.

I can get access to the Statemachine and Chart objects using the Simulink API.

SL = sfroot; 
MDL = SL.find('-isa','Simulink.BlockDiagram');
ch = MDL.find('-isa','Stateflow.Chart'); % give the Chart object

But the chart object does not contain an element representing the chartFileNumber as stored in the mdl-file.

So: How can I access this counter from within an Matlab function (m-file)?

Regards, Jonatan Antoni

[Kaustubha Govind]

Jonatan: Perhaps you can tell us a little bit about why you need to know that number? Since it is not part of the published API, I would recommend caution in attempting to have code that relies on it. (Personally, I don't know what the significance of that property is, but maybe someone else on this forum will know the answer).

[Jonatan Antoni]

The Simulink/Stateflow (embedded) coder makes use of this counter to name the state variables within the dwork structure. I try to extract the information on available state variables from Stateflow Charts in order to integrate it with custom code, i.e. having the ability to check whether a statemachine is in a certain state. Perhaps there is another way to get this information without directly accessing this property.