ttk::label , a Tk command, is the ttk analogue of label.
Kevin provides, on comp.lang.tcl, a working example of automatic text wrapping using a Tile label widget.
package require tile ttk::label .l -text {This is a very long line of text that I hope will dynamically wrap based upon the width of the widget.} -justify left -anchor w grid .l -sticky ew grid columnconfigure . 0 -weight 1 bind .l <Configure> {%W configure -wraplength [winfo width %W]}