Properties panel of elements
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Contextual menu
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* Properties: 
  * if an edit mode is active
    * if element in edit mode (XSLT or SCXML), use the special panel
    * else use the usual panel
  * else use the usual panel

* Extended properties:
  * if edit mode none, 
     * if exists an extended property -> edit it
     * else use the normal panels
  * else (edit mode enabled)
     * if the element is special, use the normal panel
     * else use normal panel

* Recall from navigators:
  * Use always the special panel properties forcing ig
