How to add an image at right hand side of textblock when numeric change

How to add an image at right hand side of textblock when numeric change

GridView is bind with this class, when number > 0 use up arrow image at right hand side of textblock

public class Stock: INotifyPropertyChanged
    {
        private string stockID;
        private double lastPrice;
        private double vGMoment;

        public Stock()
        {
  
        }

        public string StockID
        {
            get 
            { 
                return stockID; 
            }
            set
            {
                if (StockID != value)
                {
                    stockID = value;
                    OnPropertyChanged("StockID");
                }
            }
        }
        public double LastPrice
        {
            get { return lastPrice; }
            set
            {
                if (LastPrice != value)
                {
                    lastPrice = value;
                    OnPropertyChanged("LastPrice");

                    
                }
            }
        }
        public double VGMoment
        {
            get
            {
                return vGMoment;
            }
            set
            {
                if (VGMoment != value)
                {
                    vGMoment = value;
                    OnPropertyChanged("VGMoment");
                }
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;
        private void OnPropertyChanged(String info)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(info));
            }
        }

        
    }

Image imgMessage = new Image();
                imgMessage.Visibility = System.Windows.Visibility.Collapsed;
                BitmapImage bi = new BitmapImage();

                bi.BeginInit();
                bi.UriSource = new Uri(@"C:\Users\Documents\Visual Studio 2010\Projects\testrealtimdatagrid\testrealtimdatagrid\bin\Debug\green-up-arrow.gif", UriKind.RelativeOrAbsolute);
                bi.EndInit();

                imgMessage.Source = bi;

                InlineUIContainer iuc = new InlineUIContainer(imgMessage);
                this.Inlines.Add(iuc);
                this.Inlines.Add(run);

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