Tree-View Window Styles

A tree view's window style can include one or more of the following values.

TVS_DISABLEDRAGDROP	Prevents the tree-view control from sending TVN_BEGINDRAG notification messages.
TVS_EDITLABELS	Allows the user to edit the labels of tree-view items.
TVS_HASBUTTONS	Displays plus (+) and minus (-) buttons next to parent items. The user clicks the buttons to expand or collapse a parent item's list of child items. To include buttons with items at the root of the tree view, TVS_LINESATROOT must also be specified.
TVS_HASLINES	Uses lines to show the hierarchy of items.
TVS_LINESATROOT	Uses lines to link items at the root of the tree-view control. This value is ignored if TVS_HASLINES is not also specified.
TVS_SHOWSELALWAYS	Causes a selected item to remain selected when the tree-view control loses focus.

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