By default, ShowLinksOnCollapse property is True. Use the ShowLinksOnCollapse property to show the links between collapsed elements. The ExpandLinkedElements property specifies whether the elements displays the expand/collapse glyphs when the element has outgoing elements ( the OutgoingLinks property specifies the links that starts from the element ). Use the Visible property of the Link to hide a specific link. The ShowLinksColor(exShowCollapsedLinks) / ShowLinksStyle( exShowCollapsedLinks) / ShowLinksWidth(exShowCollapsedLinks) property specifies how the collapsed links are shown.

The following screen shot shows a link between two child elements, when both parents are expanded:

Having the ShowLinksOnCollapse property on True, the following screen shot shows the link when one parent is collapsed:

Having the ShowLinksOnCollapse property on True, the following screen shot shows the link when both parents are collapsed:

In other words, the ShowLinksOnCollapse property allows you to still display the links for collapsed elements. A collapsed link is shown between expanded and visible elements.