Insert no DbGrid usando o RxMemoryData

  if ( not tblcheques.Active ) then tblcheques.Open else tblcheques.EmptyTable;
      with tblcheques do
      begin
         Insert;
         Fields[00].AsString   := TxtCod.text;
         Fields[01].AsString   := TxtNom.text;
         Fields[02].AsString   := Cheque;
         Fields[03].AsCurrency := StrToFloat( txtVal.Text );
         Fields[04].AsDateTime := Datado;
         Post;
      end;