By default, the HasLines property is True. The HasLines property retrieves or sets a value that indicates whether the control links the child items to their parents. Use the HasButtons property to specify whether the parent items displays a +/- sign to let user expands or collapses items. Use the HasLinesAtRoot property retrieves or sets a value that indicates whether the control draws the lines that link the root items. The HasLines property has effect only if the ExpandFolders property it True.