diff --git a/src/com/actelion/research/gwt/gui/editor/DrawArea.java b/src/com/actelion/research/gwt/gui/editor/DrawArea.java
index b2d20992..540845dd 100644
--- a/src/com/actelion/research/gwt/gui/editor/DrawArea.java
+++ b/src/com/actelion/research/gwt/gui/editor/DrawArea.java
@@ -307,10 +307,12 @@ public void onKeyDown(KeyDownEvent event) {
         meta = event.isMetaKeyDown() || event.isControlKeyDown();
         code = event.getNativeKeyCode();
         if (!meta && isValidKey(code)) {
+          event.stopPropagation();
           event.preventDefault();
         } else if (meta) {
           if (code == KeyCodes.KEY_C) {
             copyMolecule();
+            event.stopPropagation();
             event.preventDefault();
           }
         }
@@ -321,6 +323,7 @@ public void onKeyDown(KeyDownEvent event) {
       public void onKeyUp(KeyUpEvent event) {
         code = event.getNativeKeyCode();
         if (!meta && isValidKey(code)) {
+          event.stopPropagation();
           event.preventDefault();
           handler.onKey(new ACTKeyEvent(code, event, // .isShiftKeyDown(),
               pressed ? (ACTKeyEvent.LETTER | ACTKeyEvent.DIGIT) : 0));
@@ -335,6 +338,7 @@ public void onKeyPress(KeyPressEvent event) {
         pressed = true;
         code = event.getCharCode();
         if (isValidKey(code)) {
+          event.stopPropagation();
           event.preventDefault();
         }
       }