TypeError: Error #1010: A term is undefined and has no properties.
    at mx.controls::DataGrid/drawColumnBackground()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:3374]
    at mx.controls::DataGrid/drawLinesAndColumnGraphics()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:3702]
    at mx.controls::DataGrid/drawLinesAndColumnBackgrounds()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:3594]
    at mx.controls::DataGrid/updateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:1810]
    at mx.controls.listClasses::ListBase/validateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\listClasses\ListBase.as:3966]
    at mx.managers::LayoutManager/validateDisplayList()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:663]
    at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:718]
    at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1072]