создать кнопку(button) которая будет чутка темнее фона терминала

kasper.by/blog/palitra-web-tsvetov

//+------------------------------------------------------------------+
//|                                                     CvetFona.mq4 |
//|                                              Copyright 2018, AM2 |
//|                                      http://www.forexsystems.biz |
//+------------------------------------------------------------------+
#property copyright "Copyright 2018, AM2"
#property link      "http://www.forexsystems.biz"
#property version   "1.00"
#property strict
#property indicator_chart_window


#import "user32.dll"
int GetDC(int hwnd);
int ReleaseDC(int hwnd,int hdc);
#import "gdi32.dll"
color GetPixel(int hdc,int x,int y);
#import
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping

//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
color ButtonColor(color clr)
  {
   color cl=clrNONE;

   switch(clr)
     {
      case clrWhite:
         cl=clrRed;
         break;
      case clrBlack:
         cl=clrBlue;
         break;
     }
   return(cl);
  }
//+------------------------------------------------------------------+
//| 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[])
  {
//---
   int hwnd=WindowHandle(Symbol(),Period());
   int hdc=GetDC(hwnd);
   color back_ground=GetPixel(hdc,1,2);
   ReleaseDC(hwnd,hdc);
   Comment("\n Цвет фона: "+(string)back_ground,
           "\n Цвет кнопки: "+(string) ButtonColor(back_ground));
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+