Correct usage of CChartObjectHLine standard library

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Hello everyone, everything good?

I'm using the standard library to handle "CChartObjectHLine" lines

In this parent class "CChartObject" we have the ability to write the line settings to a file using the method 


virtual bool Save(const int file_handle);

Now I would like to open this configuration in a graph that has been started and is blank using the method 

virtual bool Load(const int file_handle);

But this is not possible, because the Load method depends on the "m_chart_id" variable being filled 

if(file_handle==INVALID_HANDLE || m_chart_id==-1)
      return(false);

How to fill this variable without adding an object to the graph?

Since the "CChartObject" class declares this property in "protected" 

protected: 
        long m_chart_id; // identifier of chart the object belongs to

Should the class have a method to set this property? Or am I doing something wrong?

In my code I'm doing it like this 

#include <ChartObjects\ChartObjectsLines.mqh>

CChartObjectHLine THLineMTG;

THLineMTG.Load(gHandleFile);


If I'm wrong, can you help me with my doubt!?

Thank you very much
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