Programming: List Control with that fantastic Groups (WinXP) as in DVD Shrink

[Christoph_K]

Hello!
I'm a programmer, i am programming C/C++ WinAPI ...
My question is:
how i can add these wonderful "Groups" in a ListView Control?

I wrote this function:

void ListView_InsertGroupEx(HWND hListView, const char *szHeader, int iID)
{
ListView_EnableGroupView(hListView, true);

LVGROUP lvg;
lvg.cbSize = sizeof(LVGROUP);
lvg.mask = LVGF_GROUPID | LVGF_ALIGN | LVGF_HEADER;
lvg.pszHeader = L"here i want the variable szHeader. how?";
lvg.cchHeader = wcslen(lvg.pszHeader);
lvg.iGroupId = iID;
lvg.uAlign = LVGA_HEADER_LEFT;

if(ListView_InsertGroup(hListView, iID, &lvg) == -1)
MessageBox(0, "Error Group", 0, 0);
}

But if i use it with:

ListView_InsertGroupEx(GetDlgItem(hDlg, IDC_LIST), "This is the Group header 1", 0);
ListView_InsertGroupEx(GetDlgItem(hDlg, IDC_LIST), "This is the Group header 2", 1);
ListView_InsertGroupEx(GetDlgItem(hDlg, IDC_LIST), "This is the Group header 3", 2);

Then there appears only ONE Group (the first one).

WHY??
I initialized CommonControls in my Application AND added a Manifest to use Windows XP Visual Styles. But why does it not work???

Please help me!