Added method to obtain a contact's chat window.

git-svn-id: http://voip.null.ro/svn/yate@2145 acf43c95-373e-0410-b603-e72c3f656dc1

yatecbase.h

@@ -2350,6 +2350,13 @@ public:
     inline bool showChat(bool active)
 	{ return Client::self() ? Client::self()->setVisible(m_chatWndName,active) : false; }
 
+    /**
+     * Get the chat window
+     * @return Valid Window pointer or 0
+     */
+    inline Window* getChatWnd() const
+	{ return Client::self() ? Client::self()->getWindow(m_chatWndName) : 0; }
+
     /**
      * Create the chat window
      * @param force True to destroy the current one if any