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TreeListNode.SelectImageIndex Property

Gets or sets the index of the node’s select image from the TreeList.SelectImageList collection displayed when this node is focused.

Namespace: DevExpress.XtraTreeList.Nodes

Assembly: DevExpress.XtraTreeList.v22.2.dll

NuGet Package: DevExpress.Win.TreeList


public virtual int SelectImageIndex { get; set; }

Property Value

Type Default Description
Int32 0

An integer value that specifies the zero-based index of the select image displayed when the node is focused.


Nodes can display the following icons:

  • Select Image - two icons that automatically switch when a node gets / loses the focus.
  • State Image - any custom icon.


Select Image

Specify image source

The TreeList.SelectImageList property specifies an ordered (indexed) collection that stores images. You can use the following image collections:

Assign images to nodes

To specify the index of the image displayed in a particular node, use the following properties and events:

  • the TreeList.ImageIndexFieldName property — specifies the name of the data field that contains image indexes. The property specifies the image index for both non-focused and focused states (you cannot use data source fields to specify two icons).

  • the TreeListNode.ImageIndex and TreeListNode.SelectImageIndex properties — get or set the node’s image index in the non-focused and focused states, respectively. Images are automatically changed when a node gets / loses the focus.


    The SelectImageIndex and ImageIndex properties are not in effect if the TreeList obtains image indices from a data source field (ImageIndexFieldName).

    // Gets the select image index of the focused node.
    int selectImageIndex = treeList1.GetFocusedRowCellValue(treeList1.ImageIndexFieldName);
  • the TreeList.GetSelectImage event — fires before a node is displayed and allows you to specify (override) the image index for the processed node.

If the index is out of range, no image is displayed.

Respond to clicks

The TreeList.RowSelectImageClick event fires when a select image is clicked.


The code below shows how to assign select and state images to nodes.

using DevExpress.XtraTreeList.Nodes;

// Data source for select (left) images.
treeList1.SelectImageList = imageCollection1;
// Use the data source to assign select images to nodes.
// Data source fields do NOT allow you to specify
// two images that depend on the focus.
// This property has priority over the node's
// ImageIndex and SelectImageIndex properties.
treeList1.ImageIndexFieldName = "ImageIndex";
// Data source for state (right) images.
treeList1.StateImageList = imageCollection1;
// Use the Load event to assign images to nodes.
treeList1.Load += TreeList1_Load;

private void TreeList1_Load(object sender, EventArgs e) {
    foreach (TreeListNode node in treeList1.Nodes) {
        // The left image displayed when the node is NOT focused.
        node.ImageIndex = 0;
        // The left image displayed when the node is focused.
        node.SelectImageIndex = 1;
        // The right image that does not depend on the focus.
        node.StateImageIndex = 2;
See Also