Show/Add an Item from/to Some ComboBoxs in C++ Builder XE8 - c++

Question

I need your help to resolve my 2 problems.
I'm using 3 ComboBoxs (CB). When choosing an item from 1st CB, then an item of 2nd & 3rd CB will automatically come up .
On Delphi, all settings are work so well via "Text" property.
1st CB contains:
Google
Yahoo
2nd CB contains:
8.8.8.8
9.9.9.9
3rd CB contains:
8888
9999
Below is my code on Delphi :
procedure TForm.1stCBChange(Sender: TObject);
begin
if 1stCB.Text = 'Google' then begin
2ndCB.Text := '8.8.8.8';
3rdCB.Text := '8888';
end else
if 1stCB.Text = 'Yahoo' then begin
2ndCB.Text := '9.9.9.9';
3rdCB.Text := '9999';
end;
end;
The problem is that on C++ Builder XE8, it's not work properly via "Text" property. On the other words, the 2nd & 3rd CB's item is not shown via "Text" property.
void __fastcall TForm::1stCBChange(TObject *Sender)
{
if (1stCBChange->Text == "Google")
{
2ndCB->Text = "8.8.8.8";
3rdCB->Text = "8888";
}
else
if (1stCBChange->Text == "Yahoo")
{
2ndCB->Text = "9.9.9.9";
3rdCB->Text = "9999";
}
}
So to make it works, I have to use "ItemIndex" property.
void __fastcall TForm::1stCBChange(TObject *Sender)
{
if (1stCBChange->ItemIndex == 0)
{
2ndCB->ItemIndex = IntToStr(0);
// or 2ndCB->ItemIndex = 0;
3rdCB->ItemIndex = IntToStr(0);
}
else
if (1stCBChange->ItemIndex == 1)
{
2ndCB->ItemIndex = IntToStr(1);
3rdCB->ItemIndex = IntToStr(1);
}
}
I've tried some ways, but not works, e.g. 2ndCB->Items->Objects[1] = (TObject*) new String("8.8.8.8"); or 2ndCB->Items->AddObject("8.8.8.8",2ndCB); so on and on...
So my question: how to make it works on C++ Builder XE8 via "Text" option really like on Delphi ?
Thank you very much for your help.

Answer 1

About your first problem: you probably don't have the same Style property on the Combobox in Delphi and C++Builder. Setting it to csDropDown allows you to specify the Text, but csDropDownList doesn't.
Now, ItemIndex is an integer property, so the call to IntToStr is not needed. It shouldn't even compile, as you can't assign text to an integer variable, and in XE5 at least it doesn't. If it works later it must be because there is an operator int() or similar for UnicodeString, although I didn't find it on the latest documentation.
About your second issue: Add() adds the passed string to the end of the list. If you want to insert the string in a specific position, then you need to call Insert() which asks you for the position to insert it, in your case it would be 0. This, of course, assumes the StringList is not sorted.
Here is the Documentation for TStrings: http://docwiki.embarcadero.com/Libraries/XE5/en/System.Classes.TStrings