Propertt indicator

#property indicator_separate_window
#property indicator_buffers 1
#property indicator_plots   1
//---- plot Label1
#property indicator_label1  "Label1"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrRed
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1
//--- input parameters
input int MA_Period=21;
input int MA_Shift=0;
input ENUM_MA_METHOD MA_Method=MODE_SMA;
//--- indicator buffers
double         Label1Buffer[];
//--- Handle of the Custom Moving Average.mq5 custom indicator
int MA_handle;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   SetIndexBuffer(0,Label1Buffer,INDICATOR_DATA);
   ResetLastError();
   MA_handle=iCustom(NULL,0,"Examples\\Custom Moving Average",
                     MA_Period,
                     MA_Shift,
                     MA_Method,
                     PRICE_CLOSE // using the close prices
                     );
   Print("MA_handle = ",MA_handle,"  error = ",GetLastError());
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
//--- Copy the values of the indicator Custom Moving Average to our indicator buffer
   int copy=CopyBuffer(MA_handle,0,0,rates_total,Label1Buffer);
   Print("copy = ",copy,"    rates_total = ",rates_total);
//--- If our attempt has failed - Report this
   if(copy<=0)
      Print("An attempt to get the values if Custom Moving Average has failed");
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+