выдает ошибку при переключении radioBatton и как сделать связь в БД многие к одному

//---------------------------------------------------------------------------
 
#include <vcl.h>
#pragma hdrstop
 
#include "Unit1.h"
#include "Unit2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::RadioButton1Click(TObject *Sender)
{
if(RadioButton1->Checked){
DBGrid1->DataSource->DataSet =FDM_1->ADOTFacl;
DBGrid2->DataSource->DataSet =FDM_1->ADOTSpecial;
}
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton2Click(TObject *Sender)
{
if(RadioButton2->Checked){
DBGrid1->DataSource->DataSet =FDM_1->ADOTGroup;
DBGrid2->DataSource->DataSet =FDM_1->ADOTStudent;
 }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::RadioButton3Click(TObject *Sender)
{
if(RadioButton3->Checked){
DBGrid1->DataSource->DataSet = FDM_1->ADOTDiscipline;
DBGrid2->DataSource->DataSet = FDM_1->ADOTProgress;
}
}
//---------------------------------------------------------------------------