单项选择题
A.Derive from the Control class.
B.Derive from the UserControl class.
C.Derive from the FrameworkElement class.
D.Derive from the ContainerControl class.
单项选择题 YouarecreatingaWindowsFormsapplicationbyusingthe.NETFramework3.5.Youplantodevelopanewcontrolfortheapplication.YouneedtoensurethatthecontrolextendstheDataGridViewcontrolbyallowingthecellstocontainmulticoloredtext.Whatshouldyoudo？（）
单项选择题 YouarecreatingaWindowsFormsapplicationbyusingthe.NETFramework3.5.Youplantodevelopanewcontrolfortheapplication.ThecontrolwillhavethesamepropertiesasaTextBoxcontrol.Youneedtoensurethatthecontrolhasatransparentbackgroundwhenitispaintedonform.Youwanttoachievethisgoalbyusingtheminimumamountofdevelopmenteffort.Whatshouldyoudo？（）
多项选择题 YouarecreatingaWindowsFormsApplicationbyusingthe.NETFramework3.5.Yourapplciationwillbeusedbyagovernmentdepertment.Youneedtoensurethattheapplicationmeets"accessibilty"requirements.Whichthreeactionsshouldyouperform？（）