Caption Bar Text Cropped

Why does XTP crop the caption bar text and appends ...? The full text is "Properties" and there is plenty of room in the panel caption bar:

XTP 17.3.0
Office 2010 skin

LRESULT OnDockingPaneNotify(...)

if (wParam == XTP_DPN_SHOWWINDOW)
  CXTPDockingPane* pPane = (CXTPDockingPane*)lParam;
    if (!pPane->IsValid()) {
      p = new ...
      p->Creeate(
      p->SetDockingPane(pPane);
      p->SetTitle(L("Properties..."));
      pPane->Attach(p);
      p->SetOptions(xtpPaneNoFloatable|xtpPaneNoCloseable);

I can repro this still in 18.3. VS 2017. W10. 4K monitor with 150% font-scalng.
I think I use what you call the Office2010 theme. It's hard to understand all the themng in XTP, where apparently every panel and control needs to be configured separatel - and the docs are of no use.

This is not for all panels, only for some panels. XTP has no problems displaying the caption "Properties" in some panels, but in others it clips them and adds ... This is independent from the panel with, tool.

I have given details already in the bug reports I have created via your email interface over the past couple of months. Please see there for more details.