void __fastcall TForm1::StringGrid1DrawCell(TObject *Sender, int ACol,  
      int ARow, TRect &Rect, TGridDrawState State)  
{  
  if(  State.Contains( gdSelected))  
  {  
    StringGrid1->Canvas->Brush->Color= clWhite; <-- 여기에 그리드상 바탕 색으로 지정해주면 디폴트커서사라짐  
    StringGrid1->Canvas->Font->Color=clBlack;  
    StringGrid1->Canvas->Rectangle(Rect);  
    StringGrid1->Canvas->TextRect(Rect,Rect.left,Rect.top,StringGrid1->Cells[ACol][ARow]);  
  }  
}