GxTreeView CoClass (ArcObjects .NET 10.6 SDK)
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ArcObjects Library Reference (CatalogUI)  

GxTreeView CoClass

GxView that represents the tree view.

Product Availability

Available with ArcGIS Desktop.

Supported Platforms

Windows

Interfaces

Interfaces Description
IGxCatalogEvents (esriCatalog) Provides access to events that the catalog can fire.
IGxSelectionEvents (esriCatalog) Provides access to events that the ArcCatalog selection can fire.
IGxTreeView Provides access to members that control the GxTreeView.
IGxView Provides access to members that control the GxView.

Remarks

The tree view is represented by GxTreeView, and shows a hierarchical organization of your data holdings, as parents and children. It is unlikely you will need to interact programmatically with the tree view, other than to force it to reveal a particular GxObject (through the IGxTreeView::EnsureVisible method), or to initiate a renaming operation (through BeginRename).