About CXTTreeView and CXTTreeCtrl

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   CXTTreeCtrl looks a pretty nice component with multiple selection and other useful properties. However, it comes to me a problem when I wanna enable my TreeCtrl with drag and drop. From the research I found that TreeView is needed for my purpose. So I've spent rather a long time to think about how to build a customized TreeView with CXTTreeCtrl... well is that possible?

Later I found there's a hidden component CXTTreeView which can be created with 

treeview = (CXTTreeView*)(RUNTIME_CLASS(CXTTreeView)->CreateObject());

However, once I wanna access the corresponding TreeCtrl 
(eg, 
treeview->GetTreeCtrl()->ModifyStyle(...) or 
treeview->GetTreeCtrl()->InsertItem(...) )

Assert failure pop up and I could no longer proceed. 

Any solution? Should I make a customized TreeView with CXTTreeCtrl, or have another way to access the CXTTreeCtrl in CXTTreeView?

Thanks in advance.