代码说明： THeaderFocus - was derived from THeaderControl. Selection of single section is possible. Selected section is highlighted with focuse rectangle. Property SelectedSection is used to get/set selection of single section. Additionally, two notification events were added: OnMouseEnter and OnMouseLeave - exposure internal notifications CM_MOUSEENTER and CM_MOUSELEAVE. 从THeaderControl中来。可以选择单个段，选中的段变成高亮

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