Gets or sets the key of the default image shown when a TreeNode is in a selected state.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
If a TreeNode does not have a selected image set, the image specified by the property will be shown when the node is not selected.
The SelectedImageIndex properties are mutually exclusive; if one is set, the other is ignored. If you set the property, the SelectedImageIndex property is automatically set to -1. Alternatively, if you set the SelectedImageIndex property, the is automatically set to an empty string ("").and
Available since 2.0