Fixes copy/pasting objects with sub dialogs

include/class_CopyPasteHandler.inc

@@ -261,8 +261,7 @@ class CopyPasteHandler
       }
       if ($this->current) {
         $display = $this->current['object']->execute();
-        if (isset($this->current['object']->dialog) &&
-            (is_object($this->current['object']->dialog) || $this->current['object']->dialog)) {
+        if ($this->current['object']->dialogOpened()) {
           return $display;
         } else {
           // Display ok, (apply) and cancel buttons