private void UncheckAll()
 {
     if (m_selectedProject != null)
     {
         ProjectSetContainerNodeViewModel folder = m_selectedProject as ProjectSetContainerNodeViewModel;
         if (folder != null)
         {
             folder.UncheckRecursively();
         }
         else
         {
             m_selectedProject.IsIncluded = null;
         }
     }
 }