COMBOBOX problems

I use a SDI Interface and i launch a DialogBox who contain a combobox,
before XXXX.DoModal(); I want to AddString or InsertString in the combobox but Visual c++ 6.0 d'ont want to execute this code.
Can you help me.

You cant add strings to the combo-box before DoModal() because the combo box hasnt been created.
During the DoModal process, OnInitDialog (WM_INITDIALOG) is called (before the dlg is shown) and here you can add the strings to the combobox.

If what you are trying to do is something like a results list (i.e. you are doing some processing and adding strings to the list, then when you finish processing display the dlg) there are a few other options available to you.

1. In your application, create a CStringList, add the strings to this, and then pass the string list to the dlg before DoModal, and in OnInitDialog, iterate through the list and add the strings to the combo-box

2. Add a function to the dlg class to take the strings, which it then holds internally, and uses to populate the dlg during OnInitDialog.

You should override your Dialog InitDialog() function like this:

BOOL CMyDialog::InitDialog()
{
CDialog::InitDialog();

(CComboBox*)GetDlgItem(IDC_COMBO1)->AddString("String1");

return TRUE;
}