Get rid of the quote! - nick > On 13 Jun 2016, at 16:32, Mark Green <mark@antelope.nildram.co.uk> wrote: > > Hi, > > I am trying to write a function that extends part of a CAPI interface as follows: > > (defun addchooser (data interface) > (let ((chooser-layout (slot-value interface 'choosers)) > (new-chooser (make-instance 'push-button :data "Sheep"))) > (setf (layout-description chooser-layout) (append (layout-description chooser-layout) '(new-chooser))))) > > However, when used this generates a "cannot find pane" error, presumably because the variable new-chooser is disposed of outside of the let form. But how do I prevent this? Do I have to store it in a named global variable somehow? > > Mark > > _______________________________________________ Lisp Hug - the mailing list for LispWorks users lisp-hug@lispworks.com http://www.lispworks.com/support/lisp-hug.html