constants ExpandButtonEnum
Specifies the appearance for +/- buttons being displayed if the HasButtons property is not null.

NameValueDescription
exNoButtons0 The control displays no expand buttons.
exPlus-1 A plus sign is displayed for collapsed nodes, and a minus sign for expanded nodes.( )
exArrow1 The control uses icons to display the expand buttons.( )
exCircle2 The control uses icons to display the expand buttons. ( )
exWPlus3 The control uses icons to display the expand buttons. ( )
exCustom4 The HasButtonsCustom property specifies the index of icons being used for +/- signs on parent nodes.