Till Brychcy  provides
the following example:


	radiobutton .times -text Times -anchor w
	radiobutton .helvetica -text Helvetica -anchor w
	radiobutton .courier -text Courier -anchor w
	pack .times .helvetica .courier -side top -fill x

Note that you are using anchor west in the widgets themselves, and not in
the packer.  This lets the packer produce full width buttons.