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diff --git a/indra/newview/llparticipantlist.h b/indra/newview/llparticipantlist.h
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+/** 
+ * @file llparticipantlist.h
+ * @brief LLParticipantList intended to update view(LLAvatarList) according to incoming messages
+ *
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * 
+ * Copyright (c) 2009, Linden Research, Inc.
+ * 
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at
+ * http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+#include "llevent.h"
+
+class LLSpeakerMgr;
+class LLAvatarList;
+
+class LLParticipantList
+{
+	LOG_CLASS(LLParticipantList);
+	public:
+		LLParticipantList(LLSpeakerMgr* data_source, LLAvatarList* avatar_list);
+		~LLParticipantList();
+
+		typedef enum e_participant_sort_oder {
+			E_SORT_BY_NAME = 0,
+		} EParticipantSortOrder;
+
+		/**
+		  * Set and sort Avatarlist by given order
+		  */
+		void setSortOrder(EParticipantSortOrder order = E_SORT_BY_NAME);
+
+	protected:
+		/**
+		 * LLSpeakerMgr event handlers
+		 */
+		bool onAddItemEvent(LLPointer<LLOldEvents::LLEvent> event, const LLSD& userdata);
+		bool onRemoveItemEvent(LLPointer<LLOldEvents::LLEvent> event, const LLSD& userdata);
+		bool onClearListEvent(LLPointer<LLOldEvents::LLEvent> event, const LLSD& userdata);
+
+		/**
+		 * Sorts the Avatarlist by stored order
+		 */
+		void sort();
+
+		//List of listeners implementing LLOldEvents::LLSimpleListener.
+		//There is no way to handle all the events in one listener as LLSpeakerMgr registers listeners in such a way
+		//that one listener can handle only one type of event
+		class BaseSpeakerListner : public LLOldEvents::LLSimpleListener
+		{
+		public:
+			BaseSpeakerListner(LLParticipantList& parent) : mParent(parent) {}
+		protected:
+			LLParticipantList& mParent;
+		};
+
+		class SpeakerAddListener : public BaseSpeakerListner
+		{
+		public:
+			SpeakerAddListener(LLParticipantList& parent) : BaseSpeakerListner(parent) {}
+			/*virtual*/ bool handleEvent(LLPointer<LLOldEvents::LLEvent> event, const LLSD& userdata);
+		};
+
+		class SpeakerRemoveListener : public BaseSpeakerListner
+		{
+		public:
+			SpeakerRemoveListener(LLParticipantList& parent) : BaseSpeakerListner(parent) {}
+			/*virtual*/ bool handleEvent(LLPointer<LLOldEvents::LLEvent> event, const LLSD& userdata);
+		};
+
+		class SpeakerClearListener : public BaseSpeakerListner
+		{
+		public:
+			SpeakerClearListener(LLParticipantList& parent) : BaseSpeakerListner(parent) {}
+			/*virtual*/ bool handleEvent(LLPointer<LLOldEvents::LLEvent> event, const LLSD& userdata);
+		};
+
+	private:
+		void onAvatarListDoubleClicked(LLAvatarList* list);
+
+		LLSpeakerMgr*		mSpeakerMgr;
+		LLAvatarList*		mAvatarList;
+
+		LLPointer<SpeakerAddListener>		mSpeakerAddListener;
+		LLPointer<SpeakerRemoveListener>	mSpeakerRemoveListener;
+		LLPointer<SpeakerClearListener>		mSpeakerClearListener;
+
+		EParticipantSortOrder	mSortOrder;
+};