Support for Collapsible Nodes (Outlining)
BCGControlBar Pro (MFC)
BCGSuite (MFC)
BCGControlBar for .NET
The out of the box outline parser recognizes source files and can be customized either programmatically or using an external XML file.
Sample code:
m_wndEdit.EnableOutlining ();
m_wndEdit.EnableAutoOutlining ();
m_wndEdit.SetOutlineMargin ();