Hi VIEIRA Cédric,
The ExpanderType set to "Arrow" is applicable only when TreeViewAdv is using the Office2016 or Metro styles. For the default and other styles, only the Plus/Minus (Classic) expander is displayed.
In the Office2016 and Metro styles, an arrow is shown instead of the plus/minus sign. You can customize the expander type based on your requirements.
Code snippets for setting styles and expander type:
this.treeViewAdv1.Style = TreeStyle.Office2016Colorful; this.treeViewAdv1.ExpanderType = ExpanderType.Arrow; |