DropDownListFor in EditorTemplate not selecting value

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We also solved the solution by populating a new SelectList that has the appropriate SelectListItem selected, but created this extension method to keep the call to DropDownListFor a little cleaner:

public static SelectList MakeSelection(this SelectList list, object selection)
{
    return new SelectList(list.Items, list.DataValueField, list.DataTextField, selection);
}

Then your DropDownListFor call becomes:

<%= Html.DropDownListFor(m => m.DocumentCategoryType, Model.DocumentCategoryTypeList.MakeSelection(Model.DocumentCategoryType)) %>

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