Draw a program graph over multiple methods

How to draw a program graph similar to but with multiple methods?

As it seems the flow of data across methods are not necessarily in the order of declaration.

Mulitple Classes

 public class Temp
    {
        //
        private int lowThreshold = 18200; // 1
        private int firstTier = 37000; // 2
        private int firstTierBase = 3572; // 3
 

        public Temp(int income, int age, bool medicareLevy, bool TBRLevy, bool LILevy) // 4
        {
            actualIncome = income - ReturnTax(income, age, medicareLevy, TBRLevy, LILevy); //5
        }
        private double ReturnTax(int income, int age, bool medicareLevy, bool TBRLevy, bool LILevy) // 6
        {
            double stage1 = 0.19; // 7
            double stage2 = 0.325; // 8
            double stage3 = 0.37; // 9
            double stage4 = 0.45; // 10
            double medicareLevyCharge = 0.02;  // 11
            double TBRLevyCharge = 0.02; // 12
....