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diff --git a/indra/llui/lllayoutstack.h b/indra/llui/lllayoutstack.h
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+/** 
+ * @file lllayoutstack.h
+ * @author Richard Nelson
+ * @brief LLLayout class - dynamic stacking of UI elements
+ *
+ * $LicenseInfo:firstyear=2001&license=viewergpl$
+ * 
+ * Copyright (c) 2001-2009, 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.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLLAYOUTSTACK_H
+#define LL_LLLAYOUTSTACK_H
+
+#include "llpanel.h"
+
+class LLLayoutStack : public LLView
+{
+public:
+	struct Params : public LLInitParam::Block<Params, LLView::Params>
+	{
+		Optional<std::string>	orientation;
+		Optional<S32>			border_size;
+		Optional<bool>			animate;
+		Optional<bool>			clip;
+		// mMinWidth and mMinHeight are calculated, not set in XML
+
+		Params();
+	};
+
+	typedef enum e_layout_orientation
+	{
+		HORIZONTAL,
+		VERTICAL
+	} ELayoutOrientation;
+
+	virtual ~LLLayoutStack();
+
+	/*virtual*/ void draw();
+	/*virtual*/ void removeChild(LLView*);
+	/*virtual*/ BOOL postBuild();
+
+	static LLView* fromXML(LLXMLNodePtr node, LLView *parent, LLXMLNodePtr output_node = NULL);
+
+	S32 getMinWidth() const { return mMinWidth; }
+	S32 getMinHeight() const { return mMinHeight; }
+	
+	typedef enum e_animate
+	{
+		NO_ANIMATE,
+		ANIMATE
+	} EAnimate;
+
+	void addPanel(LLPanel* panel, S32 min_width, S32 min_height, BOOL auto_resize, BOOL user_resize, EAnimate animate = NO_ANIMATE, S32 index = S32_MAX);
+	void removePanel(LLPanel* panel);
+	void collapsePanel(LLPanel* panel, BOOL collapsed = TRUE);
+	S32 getNumPanels() { return mPanels.size(); }
+
+protected:
+	LLLayoutStack(const Params&);
+	friend class LLUICtrlFactory;
+
+private:
+	struct LayoutPanel;
+
+	void updateLayout(BOOL force_resize = FALSE);
+	void calcMinExtents();
+	S32 getDefaultHeight(S32 cur_height);
+	S32 getDefaultWidth(S32 cur_width);
+
+	const ELayoutOrientation mOrientation;
+
+	typedef std::vector<LayoutPanel*> e_panel_list_t;
+	e_panel_list_t mPanels;
+	LayoutPanel* findEmbeddedPanel(LLPanel* panelp) const;
+
+	S32 mMinWidth;  // calculated by calcMinExtents
+	S32 mMinHeight;  // calculated by calcMinExtents
+	S32 mPanelSpacing;
+
+	bool mAnimate;
+	bool mClip;
+}; // end class LLLayoutStack
+
+#endif