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procedure TForm1.FindDialog1Find(Sender: TObject);
var Buffer, Pos, tPointer : PChar;
    BuffLength            : Word;
begin
   With Sender as TFindDialog do
   begin
      GetMem(tPointer, Length(FindText) + 1);
      StrPCopy(tPointer, FindText);
      BuffLength:= Memo1.GetTextLen + 1;
      GetMem(Buffer,BuffLength);
      Memo1.GetTextBuf(Buffer,BuffLength);
      Pos:= Buffer + Memo1.SelStart + Memo1.SelLength;
      Pos:= StrPos(Pos, tPointer);
      if Pos = NIL then 
        MessageBeep(0)
      else
      begin
         Memo1.SelStart:= Pos - Buffer;
         Memo1.SelLength:= Length(FindText);
      end;
      FreeMem(tPointer, Length(FindText) + 1);
      FreeMem(Buffer,BuffLength);
      Memo1.SetFocus;
  end;
end;                    

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procedure TForm1.Button1Click(Sender: TObject);
begin
  FindDialog1.Execute;
end;