Inno Setup Disable checkbox if another checkbox is selected

Question

I need to disable some checkbox if another one as been selected yet.
How can I do this?

This is my code:

procedure InitializeWizard();
begin
  AddonPage:= CreateCustomPage(wpSelectTasks,'','Please choose BlueDose preference:');

  CheckListBox := TNewCheckListBox.Create(AddonPage);
  CheckListBox.BorderStyle := bsNone;
  CheckListBox.ParentColor := True;
  CheckListBox.MinItemHeight := WizardForm.TasksList.MinItemHeight;
  CheckListBox.ShowLines := False;
  CheckListBox.WantTabs := True;
  CheckListBox.Parent := AddonPage.Surface;
  CheckListBox.AddGroup('Select Language:', '', 0, nil);
  CheckListBox.AddCheckBox('Italian', '', 0, False, True, False, true, nil);
  CheckListBox.AddCheckBox('English', '', 0, False, True, False, true, nil);
end;

Answer 1

It looks like you do not want checkboxes at all, you want radio buttons:

CheckListBox.AddRadioButton('Italian', '', 0, False, True, nil);
CheckListBox.AddRadioButton('English', '', 0, False, True, nil);

---

You can also consider using CreateInputOptionPage instead of generic CreateCustomPage. Your code will be much simpler:

var
  AddonPage: TInputOptionWizardPage;

procedure InitializeWizard();
begin
  AddonPage :=
    CreateInputOptionPage(
      wpSelectTasks, '', 'Please choose BlueDose preference:', 'Select language',
      True, False);

  AddonPage.Add('Italian');
  AddonPage.Add('English');
end;