constants ExpandButtonEnum
Defines how the control displays the expanding/collapsing buttons. The HasButtons property Adds a button to the left side of each parent item. The user can click the button to expand or collapse the child items as an alternative to double-clicking the parent item. The ExpandButtonEnum type supports the following values:

NameValueDescription
exNoButtons0 The control displays no expand buttons
exPlus-1 (by default) A plus sign is displayed for collapsed items, and a minus sign for expanded items.( )
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 Background(exTreeGlyphCollapsed) / Background(exTreeGlyphExpanded) property specifies the visual appearance to show the glyph next to the collapsed/expanded element.