Ordering properties in a PropertyGrid

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C#

I'm using a PropertyGrid in C# to display ConfigurationElements. I have an implementation of a ExpandableObjectConverter TypeConverter to display the sub-elements (with descriptions) in the property grid.

E.g.

Item 1
     First sub-item
     Item 1 ID
     Second sub-item
     x
Item 2
     First sub-item
     Item 2 ID
     Second sub-item
     x
...

I want to display the sub-elements in a specific order - not alphabetically (e.g. The ID before the other sub-elements).

Could anyone please tell me how to specify the ordering? (I've Googled it, looked at CodeProject articles, looked on MSDN - where I (momentarily) thought I'd found a solution using SortProperties - which turns out not to be overridable.)

Any ideas would be much appreciated.