InvokeMethod and ParameterModifier

I am using late binding to call a method in a COM object. There are three ref arguments in this function. I used ParameterModifier class to indicate this. The problem is that I am expecting the third argument to get a value but it get nothing. The function does succeed.

The method signature according to the documentation:

Code:

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public virtual int Create(ref object XMLSource, ref bool ModifyIfExists, ref string CptNumGenerated)

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The method where I call this function.

Code:

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      public int AddHoursEntry(string xml)
        {
            int result = 0;
            if (IsConnectedToDatabase)
            {
                object hoursEntry = this.InterfaceType.InvokeMember("HoursEntry", BindingFlags.GetProperty, null, this.MaestroObject, null);
                if (hoursEntry != null)
                {
                    string cpt = "0";
                    bool modify = false;

                    object[] args = {xml, modify, cpt};

                    ParameterModifier p = new ParameterModifier(3);
                    p[0] = true;
                    p[1] = true;
                    p[2] = true;

                    ParameterModifier[] mods = { p };

                    result = (int)hoursEntry.GetType().InvokeMember("Create",
                        BindingFlags.InvokeMethod,
                        null,
                        hoursEntry,
                        args,
                        mods,
                        null,
                        null);

                    if (result == 0)
                        result = Convert.ToInt32(cpt); // Expecting the cpt value to be > 0                   
                    else
                    {
                        object errorObj = this.interfaceType.InvokeMember("GetErrors", BindingFlags.InvokeMethod, null, this.MaestroObject, null);
                        if (errorObj != null)
                        {
                            this.LastError = (string)errorObj.GetType().InvokeMember("XML", BindingFlags.GetProperty, null, errorObj, null);
                        }
                        else
                            this.LastError = "Error unknown!";
                    }
                }
            }
            return result;
        }

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Can anyone see anything I am doing wrong?

Mike B