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diff --git a/utils/hlfaceposer/mxexpressionslider.h b/utils/hlfaceposer/mxexpressionslider.h
new file mode 100644
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+++ b/utils/hlfaceposer/mxexpressionslider.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef MXEXPRESSIONSLIDER_H
+#define MXEXPRESSIONSLIDER_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include <mxtk/mxWindow.h>
+#include <mxtk/mxCheckBox.h>
+
+#define IDC_INFLUENCE 1000
+
+class mxExpressionSlider : public mxWindow
+{
+public:
+	enum
+	{
+		MAGNITUDE_BAR = 0,
+		BALANCE_BAR = 1,
+
+		NUMBARS = 2
+	};
+
+	mxExpressionSlider (mxWindow *parent, int x, int y, int w, int h, int id );
+	~mxExpressionSlider( void );
+	
+	void SetTitleWidth( int width );
+	void SetDrawTitle( bool drawTitle );
+
+	void SetMode( bool paired );
+
+	void setValue ( int barnum, float value);
+	void setRange ( int barnum, float min, float max, int ticks = 100);
+	void setInfluence ( float value );
+	void setEdited( bool isEdited );
+
+	// ACCESSORS
+	float getRawValue( int barnum ) const;
+
+	float getValue( int barnum ) const;
+	float getMinValue( int barnum ) const;
+	float getMaxValue( int barnum ) const;
+	float getInfluence( ) const;
+
+	void setEdited( int barnum, bool isEdited );
+	bool isEdited( int barnum ) const;
+
+	virtual void redraw();
+	virtual bool PaintBackground( void );
+
+	virtual int			handleEvent (mxEvent *event);
+
+private:
+	void	BoundValue( void );
+
+	void	GetSliderRect( RECT& rc );
+	void	GetBarRect( RECT &rc );
+	void	GetThumbRect( int barnum, RECT &rc );
+
+	void	DrawBar( HDC& dc );
+	void	DrawThumb( int barnum, HDC& dc );
+	void	DrawTitle( HDC &dc );
+
+	void	MoveThumb( int barnum, int xpos, bool finish );
+
+	int		m_nTitleWidth;
+	bool	m_bDrawTitle;
+
+	float	m_flMin[ NUMBARS ], m_flMax[ NUMBARS ];
+	int		m_nTicks[ NUMBARS ];
+	float	m_flCurrent[ NUMBARS ]; // slider location (amount/balance)
+
+	float	m_flSetting[ NUMBARS ]; // paired flex input values (right/left)
+	bool	m_bIsEdited[ NUMBARS ]; // paired flex input values (right/left)
+
+	bool	m_bDraggingThumb;
+	int		m_nCurrentBar;
+
+	bool	m_bPaired;
+
+	mxCheckBox	*m_pInfluence;
+};
+
+
+#endif // MXEXPRESSIONSLIDER_H