The tk way of getting stuff to respond to click is with the bind command, so bind to the table, then figure out what cell was clicked , then get its value and do whatever
http://docs.activestate.com/activeperl/5.16/lib/Tcl/tkkit.html
http://docs.activestate.com/activetcl/8.5/tktable/tkTable.html
http://docs.activestate.com/activetcl/8.5/tcl/TkCmd/bind.htm