Index: library/nx/nx.tcl
===================================================================
diff -u -ra866226c4ca39c65f5f98539c140326c617da884 -rc281c2d34f67092885aca29f6ccc16363713b54d
--- library/nx/nx.tcl	(.../nx.tcl)	(revision a866226c4ca39c65f5f98539c140326c617da884)
+++ library/nx/nx.tcl	(.../nx.tcl)	(revision c281c2d34f67092885aca29f6ccc16363713b54d)
@@ -1621,6 +1621,20 @@
       error "object $object has already an instance variable named '${:name}'"
     }
     set options [:getParameterOptions -withMultiplicity true]
+    #
+    # TODO: How to handle options selection for ::nsf::is?
+    #
+    set options [lsearch -all -inline -not -regexp $options [join {
+	slotassign
+	slotinitialize
+	positional
+	convert
+	substdefault
+	noconfig
+	initcmd
+	required
+    } |]]
+		 
     if {[llength $options]} {
       ::nsf::is -complain [join $options ,] $value
     }