修改窗体风格

 //设置Tree窗口风格
 DWORD wndType = ::GetWindowLong(m_pTreeCtrl->m_hWnd, GWL_STYLE);
 wndType |= TVS_HASLINES | TVS_LINESATROOT | TVS_HASBUTTONS;
 ::SetWindowLong(m_pTreeCtrl->m_hWnd, GWL_STYLE, wndType);

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