How to customize the height of the SfProgressBar, when the ProgressType is SolidLinear?

<progressbar:SfProgressBar  x:Name="progressBar"
                Grid.Row="1" Width="300"
                local:ProgressBarAdv.SolidLinearHeight="30"        
                ProgressType="SolidLinear"                               
                Value="50" 
                BorderBrush="LightGray"               
                />

        public static void UpdateProgressBarHeight(SfProgressBar progressbar)
        {
            Grid Root_Grid = VisualTreeHelper.GetChild(progressbar, 0) as Grid;
            if (MainPage.isload)
            {
                Grid SolidLinear = Root_Grid.Children[0] as Grid;
                Grid Parent_Grid = SolidLinear.Children[0] as Grid;
                Border PART_OuterLine = Parent_Grid.Children[1] as Border;
                Border OuterLine_Border = PART_OuterLine.Child as Border;
                Grid Border_Child = OuterLine_Border.Child as Grid;
 
                double tempheight = ProgressBarAdv.GetSolidLinearHeight(progressbar);               
 
                foreach (Rectangle border in Border_Child.Children)
                {
                    PART_OuterLine.Height = tempheight;
                    OuterLine_Border.Height = tempheight;
                    Border_Child.Height = tempheight;
                    border.Height = tempheight;                   
                }
            }
        }

    public class ProgressBarAdv
    {
        public static double GetSolidLinearHeight(DependencyObject obj)
        {
            return (double)obj.GetValue(SolidLinearHeightProperty);
        }
 
        public static void SetSolidLinearHeight(DependencyObject obj, double value)
        {
            obj.SetValue(SolidLinearHeightProperty, value);
        }
 
        // Using a DependencyProperty as the backing store for SolidLinearHeight.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty SolidLinearHeightProperty =
            DependencyProperty.RegisterAttached("SolidLinearHeight", typeof(double), typeof(MainPage), new PropertyMetadata(4d, new PropertyChangedCallback(OnSolidLinearHeightChanged)));
 
        private static void OnSolidLinearHeightChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            SfProgressBar bar = d as SfProgressBar;
            MainPage.UpdateProgressBarHeight(bar);
        }
    }