+/**
+ * Built-in command: Add a dialog to the GUI system. Does *not*
+ * display the dialog. The property node should have the same format
+ * as a dialog XML configuration. It must include:
+ *
+ * name: the name of the GUI dialog for future reference.
+ */
+static bool
+do_dialog_new (const SGPropertyNode * arg)
+{
+ NewGUI * gui = (NewGUI *)globals->get_subsystem("gui");
+
+ // Note the casting away of const: this is *real*. Doing a
+ // "dialog-apply" command later on will mutate this property node.
+ // I'm not convinced that this isn't the Right Thing though; it
+ // allows client to create a node, pass it to dialog-new, and get
+ // the values back from the dialog by reading the same node.
+ // Perhaps command arguments are not as "const" as they would
+ // seem?
+ gui->newDialog((SGPropertyNode*)arg);
+ return true;
+}