C# WPF object removing

private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
       {
           SolidColorBrush myBrush = new SolidColorBrush(Colors.Red);

           StackPanel SP = new StackPanel();
           SP.Height = 50;
           SP.Width = 300;
           SP.Background = myBrush;

           TextBlock TB = new TextBlock();
           TB.Width = 30;
           TB.Height = 30;
         TB.Text = "World Of Waracrft";

           //wow search
         if (Sois.Properties.Settings.Default.sel == 2)
         {
             if (tb1.Text == "wow")
             {
                 this.sp1.Children.Add(SP);
             }

             else
             {
                 this.sp1.Children.Clear();
             }

         }



       }

this.sp1.Children.Clear();