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Obsolete TreeView is now deprecated. You can likely now use TreeView<int> instead and not think more about it. But if you were using that identifier to store InstanceID data, you should instead opt to upgrade your TreeViews to use TreeView<InstanceID> to get the proper typing.
Declaration
public int GetNumVisibleColumns();
Description
If using a MultiColumnHeader for the TreeView use this method to get the number of visible columns currently being shown in the MultiColumnHeader.