1:

Enabled:=False;					

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:

procedure TForm1.ListBox1Click(Sender: TObject);
begin
  ListBox1.ItemIndex:=-1;
  BitBtn1.SetFocus;
end;

procedure TForm1.ListBox1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  ListBox1.ItemIndex:=-1;
  BitBtn1.SetFocus;
end;

procedure TForm1.ListBox1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
  ListBox1.ItemIndex:=-1;
  BitBtn1.SetFocus;
end;					

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:

procedure TForm1.ListBox1DrawItem(Control: TWinControl; Index: Integer;
  Rect: TRect; State: TOwnerDrawState);
begin
  with (Control as TListBox) do
  begin
    Canvas.Brush.Color := Color;
    Canvas.Font.Color := Font.Color;
    canvas.FillRect(rect);
    DrawText(Canvas.Handle,
    PChar(Items[Index]),
    -1,
    Rect,
    DT_SINGLELINE or DT_VCENTER);

    if odSelected in state then Canvas.DrawFocusRect(rect);
  end;  
end;					

1:
2:
3:
4:

procedure TForm1.ListBox1Click(Sender: TObject);
begin
  if ListBox1.ItemIndex>=0 then ListBox1.Selected[ListBox1.ItemIndex]:=false;
end;					

1:
2:
3:
4:

procedure TForm1.ListBox1Click(Sender: TObject);
begin
  Listbox1.ItemIndex := -1;
end;					

1:
2:

    //if odSelected in state then Canvas.DrawFocusRect(rect);
    if odFocused in state then Canvas.DrawFocusRect(rect);					

1:
2:
3:
4:

procedure TfrmMain.lboTestEnter(Sender: TObject);
begin
  XY.SetFocus;
end;