use_copy - Use copy handle

When several controls refer to the same data source, they usually refer also to the same selected instance. Thus, one may define a list and a property window control referring to the same data source and the list item selected in the list will automatically displayed in the window control.

Sometimes, one want to refer to the same data source with different selections. In this case, this option should be switched on in order to create a copy handle with an own cursor for the data source.