The Allow LabelEdit attribute is a deprecated attribute. It will be used only if the Style of the treeviewfield is TVF_CLASSIC (see
Style Attribute). It should
not be set and will not be honored for new treeviewfields in an application, or for treeviewfields which have been modified to be no longer a TVF_CLASSIC style.
For Style TVF_EXTENDED (or equivalently, TVF_CURRENT), the bias of the treeviewfield will determine the type of editing allowed. For treeviewfields with FB_CHANGEABLE bias, the label can be fully edited. With FB_LANDABLE bias the label can be selected and copied but not changed. For more information, see
Field Bias Settings.