Use wm min/maxsize - in a uniform manner.  Here is a resizable listbox:

        #!/usr/local/bin/wish -f
        wm minsize . 20 20
        wm maxsize . 1152 900
        pack append . [listbox .l -borderwidth 2 -relief raised] {expand fill}

Doing the same with the text widget brings its resizing under control too.

Thanks to "John C Ellson"