A tree view control is a window that displays a hierarchical list of items. Each item consists of a label and an optional bitmapped image, and each item can have a list of subitems associated with it. By clicking an item, the user can expand and collapse the associated list of subitems. In addition to the window styles that apply to the common controls, there are styles specific to each new common control.

 

Tree View Control Styles
TVS_HASLINES	Has lines connecting child items to parents.
TV_LINESATROOT	Has lines connecting child items to the root of the hierarchy.
TVS_HASBUTTONS	Adds a button to the left of each parent.
TVS_EDITLABELS	Allows user to edit the labels of the items.
TVS_SHOWSELALWAYS	The selected item remains selected when the control loses focus.
TVS_DISABLEDRAGDROP	Disables drag-drop notifications.