Title: How to access the controls of a TRadioGroup
procedure RGB_EnableItem(RadioGroup: TRadioGroup; ItemIndex: Byte; bEnabled: Boolean);
begin
RadioGroup.Controls[ItemIndex].Enabled := bEnabled;
end;
// Example: Deactivates the 2. Item (Index starts at 0)
procedure TForm1.Button1Click(Sender: TObject);
begin
RGB_EnableItem(RadioGroup1, 1, False);
end;
{2. *******************************************************}
procedure RGB_ShowItem(RadioGroup: TRadioGroup; ItemIndex: Byte; bVisible: Boolean);
begin
RadioGroup.Controls[ItemIndex].Visible := bVisible;
end;
// Example: Hides the 2. Item (Index starts at 0)
procedure TForm1.Button2Click(Sender: TObject);
begin
RGB_ShowItem(RadioGroup1, 1, False);
end;
{3. *******************************************************}
// Show Hints for TRadioGroup items
procedure TForm1.Button3Click(Sender: TObject);
var
i: Byte;
begin
for i := 0 to RadioGroup1.ControlCount - 1 do
begin
RadioGroup1.Controls[i].ShowHint := True;
RadioGroup1.Controls[i].Hint := (Radiogroup1.Controls[i] as TRadiobutton).Caption;
end;
end;
{4. *******************************************************}
// Focus a specified Radiobutton in a TRadioGroup
procedure RGB_FocusItem(RadioGroup: TRadioGroup; ItemIndex: Byte);
var
RadiogroupClick: TNotifyEvent;
begin
if ItemIndex = 0 then
begin
RadioGroup.OnClick := nil;
(RadioGroup.Controls[1] as TRadiobutton).SetFocus;
RadioGroup.OnClick := RadiogroupClick;
end;
end;
// Example: Focus the 2. Radiobutton
procedure TForm1.Button4Click(Sender: TObject);
begin
RGB_FocusItem(RadioGroup1, 1);
end;