Loading also required columns for othercolumns of lookupeditor

InABox.DynamicGrid/DynamicGridColumns.cs

@@ -22,7 +22,7 @@ namespace InABox.DynamicGrid
                 var properties = DatabaseSchema.Properties(type).OrderBy(x => x.Sequence);
                 foreach (var prop in properties)
                 {
-                    if (prop.Editor != null && !(prop.Editor is NullEditor))
+                    if ((prop.Editor != null && !(prop.Editor is NullEditor)) || prop.Required)
                     {
                         var col = new DynamicGridColumn
                         {