How to resize(cut) text in CXTPTabClientWnd Tab

I use CXTPTabClientWnd for create MTI Bar, Anything is OK.  But when I open file(s) that have the long path, it shows only the first part of the full text around 30 charactors in the tab (but it's not the file name I need to show).  Then I have some question to ask.

CXTPTabClientWnd::AddItem() returns a pointer to a CXTPTabManagerItem object, which you can then use to set the tab caption and tool tip.

Something like:

class HikaTabClientWnd : CXTPTabClientWnd
{
public:
  BOOL AddTabWindow(CString& fullname, CWnd* pwnd);
};

BOOL HikaTabClientWnd::AddTabWindow(CString& fullname, CWnd* pwnd)
{
  GetPaintManager()->m_bDrawTextPathEllipsis = TRUE;        // In case name+ext too long
  CXTPTabManagerItem *pitem = AddItem(pwnd);                // Add the window
  if (pitem) {
    CXTSplitPath spath(fullname);                           // Split the path
    pitem->SetCaption(spath.GetFName() + spath.GetExt());   // Set the tab caption (name.ext)
    pitem->SetTooltip(fullname);                            // Set the tool tip to the full path
    return TRUE;
  }
  return FALSE;
}