Gets or sets the image list index value of the image that is displayed when the tree node is in the selected state.
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The TreeNode.SelectedImageIndex value is the index value of an System.Drawing.Image stored in the System.Windows.Forms.ImageList assigned to the TreeView.ImageList property.
The default value of the TreeNode.SelectedImageIndex property is the same as the TreeView.SelectedImageIndex property of the System.Windows.Forms.TreeView control that the System.Windows.Forms.TreeNode is assigned to.