ASP.NET MVC 5.1 EnumHelper.EnumDropDownListFor on enum with Flags attribute

I want to make a dropdownlist of an enum property on my ViewModel.

I've been searching for examples like this and this where they use enums for displaying a select and radiobuttons controls if a form.

I have an enum like this

class MyViewModel 
{
    public JobCategory JobCategory {get; set;}
}

[Flags]
public enum JobCategory
{
    /// <summary>
    /// Ninguna
    /// </summary>
    [Display(Name = "N/A")]
    None = 0,

    /// <summary>
    /// Diseño Grafico
    /// </summary>
    [Display(Name = "Diseño Gráfico")]
    GraphicDesign = 1

    ...
}

And the form

@model MyViewModel

<div class="col-xs-3">
        @(EnumHelper.IsValidForEnumHelper(Model.JobCategory.GetType())
        ? Html.EnumDropDownListFor(d => d.JobCategory, new { @class = "form-control" })
        : Html.EditorFor(d => d.JobCategory, new { @class = "form-control" }))
</div>

When I remove the Flags attribute the method EnumHelper.IsValidForEnumHelper(Model.JobCategory.GetType()) returns true and displays a select otherwise returns false and the form displays a textbox.

Someone know how can I use this helper without removing the Flags attribute?