DBGridEh 表单试运行错误!急急!!!(0)

各位大侠,帮帮我吧我用DBGridEh 做了表商品录入表单,当我按F9 在表单测试操作完成后退出系统提示下面错误Project CRGLXT.exe raised exception class EAccessViolation with message 'Access violation at address 005338A8 in module ' CRGLXT.exe '. Read of address 00000010'.Process stopped Use Step or Run to continue然后代码回到DBGridEh 单元的这个函数,function TColumnEh.GetHighlightRequired: Boolean;begin if cvHighlightRequired in FAssignedValues then Result := FHighlightRequired else Result := DefaultHighlightRequired;end;请问这个问题是什么原因引起的,如果能帮我解决这个问题可付费!急急急