diff --git a/src/as/com/threerings/flex/CommandComboBox.as b/src/as/com/threerings/flex/CommandComboBox.as
index b0fc18ac..1233daca 100644
--- a/src/as/com/threerings/flex/CommandComboBox.as
+++ b/src/as/com/threerings/flex/CommandComboBox.as
@@ -35,19 +35,23 @@ import com.threerings.util.CommandEvent;
  */
 public class CommandComboBox extends ComboBox
 {
+    /**
+     * The attribute of the selectedItem object that used as the argument to the
+     * command or function. If null, the entire selectedItem is passed as the argument.
+     */
+    public var argName :String;
+
     /**
      * Create a command combobox.
      *
      * @param cmdOrFn either a String, which will be the CommandEvent command to dispatch,
      *        or a function, which will be called when changed.
-     * @param argName The attribute of the selectedItem object that used as the argument to the
-     *        command or function. If null, the entire selectedItem is passed as the argument.
      */
     public function CommandComboBox (cmdOrFn :* = null, argName :String = "data")
     {
         CommandButton.validateCmd(cmdOrFn);
         _cmdOrFn = cmdOrFn;
-        _argName = argName;
+        this.argName = argName;
 
         addEventListener(ListEvent.CHANGE, handleChange);
     }
@@ -72,14 +76,12 @@ public class CommandComboBox extends ComboBox
     {
         if (this.selectedItem != null) {
             CommandEvent.dispatch(this, _cmdOrFn,
-                (_argName != null) ? this.selectedItem[_argName] : this.selectedItem);
+                (this.argName != null) ? this.selectedItem[this.argName] : this.selectedItem);
         }
     }
 
     /** The command (String) to submit, or the function (Function) to call
      * when changed,  */
     protected var _cmdOrFn :Object;
-
-    protected var _argName :String;
 }
 }