| Index: runtime/observatory/lib/src/elements/curly_block.dart
 | 
| diff --git a/runtime/observatory/lib/src/elements/curly_block.dart b/runtime/observatory/lib/src/elements/curly_block.dart
 | 
| index b0dafb80b6b30bf4434aead4958c5582b84205bd..2632f3e635655b4fef93f1f4cbeb6f76c0a69ca0 100644
 | 
| --- a/runtime/observatory/lib/src/elements/curly_block.dart
 | 
| +++ b/runtime/observatory/lib/src/elements/curly_block.dart
 | 
| @@ -24,8 +24,9 @@ class CurlyBlockElement extends PolymerElement {
 | 
|      busy = false;
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|    }
 | 
|  
 | 
| -  void toggleExpand(var a, var b, var c) {
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| +  void toggleExpand(var event, var b, var c) {
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|      assert(callback == null || expand == false);
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| +    event.stopPropagation();
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|      if (busy) {
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|        return;
 | 
|      }
 | 
| 
 |