wpf listview background issue

      I set the background property to transparent,like this



then i run the program,it looks good
next, I set the IsEnable Property to "False" , start the program again,I found the background color turned white. Why?


How do I keep transparent ,when the IsEnable is "False".

Thanks!      HiIamDave,anIndependentAdvisorandSoftwareDeveloper.Iamsorry,Communityisjustaconsumerforum,duetothescopeofyourquestion(WPFApplicationDevelopment)canyoupleasepostthisquestiontooursisterforumonMSDN(TheDeveloperNetwork)intheWPFsection(linkedbelow)OverthereyouwillhaveaccesstoahostofWPFDevelopersandwillgetaknowledgeableandquickanswertothisquestion.https://social.msdn.microsoft.com/Forums/vstudi.___________________________________________________________________PowertotheDeveloper!MSIGV72-17.3",i7-8750H(HexCore),32GBDDR4,4GBGeForceGTX1050Ti,256GBNVMeM2,2TBHDD此是否有帮助？是否抱歉，这没有帮助。太棒了！感谢你的反馈。你对此的满意度如何?感谢你的反馈，它能帮助改进网站。你对此的满意度如何?感谢你的反馈。
        HiIamDave,anIndependentAdvisorandSoftwareDeveloper.Iamsorry,Communityisjustaconsumerforum,duetothescopeofyourquestion(WPFApplicationDevelopment)canyoupleasepostthisquestiontooursisterforumonMSDN(TheDeveloperNetwork)intheWPFsection(linkedbelow)OverthereyouwillhaveaccesstoahostofWPFDevelopersandwillgetaknowledgeableandquickanswertothisquestion.https://social.msdn.microsoft.com/Forums/vstudi.___________________________________________________________________PowertotheDeveloper!MSIGV72-17.3",i7-8750H(HexCore),32GBDDR4,4GBGeForceGTX1050Ti,256GBNVMeM2,2TBHDD此是否有帮助？是否抱歉，这没有帮助。太棒了！感谢你的反馈。你对此的满意度如何?感谢你的反馈，它能帮助改进网站。你对此的满意度如何?感谢你的反馈。
        hi,dave.Thanksverymuch.IwillpostthequestiontoMSDNagain.Thankyouforyourreply.此是否有帮助？是否抱歉，这没有帮助。太棒了！感谢你的反馈。你对此的满意度如何?感谢你的反馈，它能帮助改进网站。你对此的满意度如何?感谢你的反馈。