explanation about source code of combobox

Question

I find this source code that allows me Binding ComboBox directly to enum values but I do not understand this instruction

public IList<UserType> UserTypes
{
    get
    {
        // Will result in a list like {"Tester", "Engineer"}
        return Enum.GetValues(typeof(UserType)).Cast<UserType>().ToList<UserType>();
    }
}

public UserType UserType
{
    get;
    set;
}

 knowing that this code I find it in this site :http://www.ridgesolutions.ie/index.php/2014/11/05/wpf-xaml-binding-combobox-directly-to-enum-values/