m_rootId = m_treeCtrl->AddRoot( rootName, 3, -1, rootData);
m_treeCtrl->SetItemHasChildren(m_rootId);
ExpandDir(m_rootId); // automatically expand first level
m_rootId = m_treeCtrl->AddRoot( rootName, 3, -1, rootData);
m_treeCtrl->SetItemHasChildren(m_rootId);
ExpandDir(m_rootId); // automatically expand first level