Crash with ContextMenuPresent in 10.1

Hello

I have just upgraded to 10.1 and am experiencing a crash when setting ContextMenuPresent for a popup control. The code is as follows:

XtremeCommandBars::ICommandBarPopupPtr linethicknesspopup = toolbarcontrol->GetItem(2)->FindControl(XtremeCommandB ars::xtpControlSplitButtonPopup, CM_SETTHICKLINE, _variant_t((bool)TRUE), _variant_t((bool)FALSE));
            
if (linethicknesspopup)
{
   linethicknesspopup->CommandBar->SetPopupToolBar(VARIAN T_TRUE);
   linethicknesspopup->CommandBar->Title = _bstr_t(_T("Line Thickness Popup"));  
   linethicknesspopup->CommandBar->Customizable = VARIANT_FALSE;
   linethicknesspopup->CommandBar->ContextMenuPresent = VARIANT_FALSE;
}

If I remove the ContextMenuPresent = VARIANT_FALSE line there is no crash. As it happens I don't seem to actually need that line but I thought I'd let you know of the problem anyway.