'Declaration Public Property ExpansionIndicatorVisibility As Visibility
public Visibility ExpansionIndicatorVisibility {get; set;}
If the ExpansionIndicatorVisibility property was not explicitly set to a value then it returns an appropriate visibility based on whether this record has children.
By default the property returns 'Collapsed' if there are no expandable fields. Otherwise it returns 'Visible' if there are any child records or 'Hidden' if there are none.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2