Pass enum value in command parameter

Hi,

How to pass enum value as command parameter and what would be command type in viewmodel. I am using Prism and passing enum value like below

CommandParameter="{x:Static localenum:GradeTypes.PreventiveStyle}"

my viewmodel property is

public DelegateCommand<GradeTypes> TapSubGradeCommand { get; set; }

after running my application crashes. always we need send command parameter as string or generic values in Prism.