Hi,

Better do not add or remove items directly to/from the Flowchart or Selection item collections. Instead use the provided methods, e.g. FlowChart.CreateBox or FlowChart.Add(new Box()), FlowChart.DeleteObject, etc.

DeleteObject does some more operations than removing the items from the collections, e.g. it creates an undo record, deletes arrows linked to a box, deletes groups, updates the document size, etc.

Kind Regards
Stoyan