Label Find inside a function

I have a chart in which 4 Graphical function is defined .

I want to find the Label inside a particular function.

My code is as below:-

chartArray = m.find('-isa','Stateflow.Chart')

func = chartArray(1).find('-isa','Stateflow.Function)

ft = func.find('-isa','Stateflow.Transition');

the above code give all transition label.

i need only labels inside specific function