Thank you for writing back.
You cannot edit the Items
collection directly, it is populated depending on the selected object properties and represents a list of these properties, and since you cannot change the object properties count at runtime you should not be able to change the collection as well. Nevertheless you can easily show or hide the underlying properties of each item. You can access them by using the GridItems
sender, EventArgs e)
Another solution would be to use the Browsable attribute
directly in your custom objects.
I hope this will be useful.
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