add string to combo box

[h4ever]

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I have this function which is called when Property Sheet Page is initiated:

BOOL Handle_WM_INITDIALOG2(HWND dialog)
{
	LCombo_Fill(dialog, IDC_T_UCLASS1, esdata.unitgroups.head(), L"All");
	SendMessageW(GetDlgItem(dialog, IDC_T_UCLASS1), LB_ADDSTRING, 0, (LPARAM)"Testing string");
//	UnitList_FillGroup(GetDlgItem(dialog, IDC_T_UCLASS1), NULL);
	return TRUE;
}

The control is selection box and I wanted to add item to it. The first command LCombo_FIll adds one item ("All") but this function is not to add list to control... The second command does not add anything, why?

Edit: Yet I tried:
SendMessageW(GetDlgItem(dialog, IDC_T_UCLASS1), CB_ADDSTRING, 0, (LPARAM)"Testing string"); and also no success.
CB_ADDSTRING is used in the first function.

Another test:

LRESULT index = Combo_AddStringW(GetDlgItem(dialog, IDC_T_UCLASS1), L"TEST");
Combo_SetItemData(GetDlgItem(dialog, IDC_T_UCLASS1), index, NULL);

No success...

Yet the first command:
LCombo_Fill(dialog, IDC_T_UCLASS1, esdata.unitgroups.head(), L"All");
Should add not just "All" but many string, because when I debug it, it goes through loop like it were adding strings:

	for (; list; list = list->next())
	{
		LRESULT index = Combo_AddW(combobox, list->name(), list);

		if (list == select)
		{
			SendMessage(combobox, CB_SETCURSEL, index, 0);
			ret = index;
		}
	}

but in the result nothing is displayed in the control...

Edit:
I solved the problem. It was too small height of combo box what restricted me to see complete list.