bool get_input_worksheet_name(const Worksheet& wksReport, vector<string>& vsInputWks)
{
	Tree trGUI;
	uint 	uid;
	// GRT_TYPE_GUI means get GUI tree of fitting
	// otherwise, GRT_TYPE_RESULTS to get calculation result tree of fitting
	if( !wksReport.GetReportTree(trGUI, &uid, 0, GRT_TYPE_GUI) )
		return false;		

	TreeNode trInput = trGUI.InputData;
	XYRange drXY;
	drXY.Create(trInput, false); // false means data range with multi datas
	
	if ( !drXY || !drXY.IsValid() ) // check error
		return false;
		
	// loop all datasets and get names of sheet one by one
	DWORD dwRules = DRR_GET_DEPENDENT | DRR_NO_FACTORS;
	int nNumDataset = drXY.GetNumData(dwRules);
	for (int nIndex = 0; nIndex < nNumDataset; nIndex++ )
	{
		Column colY;
		if ( drXY.GetYColumn(colY, nIndex) )
		{
			Worksheet wks;
			colY.GetParent(wks);
			if ( !wks )
				return false;
			vsInputWks.Add(wks.GetName());
		}
	}
	
	return true;
}

void test_get_fit_sheet()
{
	vector<string> vsInputWks;
	Worksheet wks = Project.ActiveLayer();
	get_input_worksheet_name(wks, vsInputWks);
	
	out_int("Number of input data: ", vsInputWks.GetSize());
	out_str("Names of input data sheet:");
	for (int ii = 0; ii < vsInputWks.GetSize(); ii++ )
	{
		out_str(vsInputWks[ii]);
	}
}