I have a property grid that has 10 items.  Each item has the exact same constraint list (not Sorted), and the first Item is <None>.  What I am doing is when the user selects an item out of the list for each grid item, I remove the selected list item from all the other grid items so that use can't make the same selection for more than one item in the property grid.  Now if the user changes his mind and selects <None>, I need to add the previously selected item back into constraint list of all the grid items. But I can't find a InsetAt method in CXTPPropertyGridItemConstraints. 

Am I missing something, or should I write my own InsertItem method?

Thanks

Ali