A bug of CXTPTabControl?

I add two editbox to CXTPTabControl!
When I use DeleteAllItems() to remove all editbox in CXTPTabControl.
There still editbox exist in tabcontrol.

I check the code and find the reason:
CXTPTabManagerItem does nothing for its m_hWnd in destructor.
That means, all window added to XTPTabControl must be destroyed manually.

So I add as below
CXTPTabManagerItem::~CXTPTabManagerItem()
{
 if(IsWindow(m_hWnd))
 {
  DestroyWindow(m_hWnd);
  m_hWnd = NULL;
 };
}
So that CXTPTabManager::DeleteItem() and DeleteAllItems() would destroy the child window as I need.

But another problem prompt:
I used a CXTPTabClientWnd
In function UpdateContents()
There is the line:
   pFoundItem->Remove();
When call this, the found CXTPTabManagerItem's window(i.e, childwindow) will be destroyed by  CXTPTabManager::DeleteItem();

While another line in UpdateContents() is :
   pChildWnd = pChildWnd->GetWindow(GW_HWNDNEXT);
when the pChildWnd->m_hWnd is destroyed, this function would be turned into assert failure!

(That is, the last childframe of multidoc app is closing, you will catch the failure)

How can I solve this?

I reffer to CXTTabCtrl:
And find there is DeleteItem(nItem, BOOL bDestroyWnd);

So the better modification of CXTPTabContorl is the same like CXTTabCtrl?
Use the parameter bDestroyWnd to let user select to destory the window?