How to properly round a progressbar in C# WPF?

Question

WPF

There is a progress bar on the form, I created a copy of its style and tried to round it...
But this miracle turned out:

What did I do wrong?
Here is the style:

Klyak for open code

<SolidColorBrush x:Key="ProgressBar.Progress" Color="#FF06B025"/>
        <SolidColorBrush x:Key="ProgressBar.Background" Color="#FFE6E6E6"/>
        <SolidColorBrush x:Key="ProgressBar.Border" Color="#FFBCBCBC"/>
        
        <Style x:Key="ProgressBarS1" TargetType="{x:Type ProgressBar}">
            <Setter Property="Foreground" Value="{StaticResource ProgressBar.Progress}"/>
            <Setter Property="Background" Value="{StaticResource ProgressBar.Background}"/>
            <Setter Property="BorderBrush" Value="{StaticResource ProgressBar.Border}"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type ProgressBar}">
                        <Grid x:Name="TemplateRoot">
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Determinate"/>
                                    <VisualState x:Name="Indeterminate">
                                        <Storyboard RepeatBehavior="Forever">
                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)" Storyboard.TargetName="Animation">
                                                <EasingDoubleKeyFrame KeyTime="0" Value="0.25"/>
                                                <EasingDoubleKeyFrame KeyTime="0:0:1" Value="0.25"/>
                                                <EasingDoubleKeyFrame KeyTime="0:0:2" Value="0.25"/>
                                            </DoubleAnimationUsingKeyFrames>
                                            <PointAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransformOrigin)" Storyboard.TargetName="Animation">
                                                <EasingPointKeyFrame KeyTime="0" Value="-0.5,0.5"/>
                                                <EasingPointKeyFrame KeyTime="0:0:1" Value="0.5,0.5"/>
                                                <EasingPointKeyFrame KeyTime="0:0:2" Value="1.5,0.5"/>
                                            </PointAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <Border CornerRadius="10" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}"/>
                            <Border x:Name="PART_Track"/>
                            <Grid x:Name="PART_Indicator" ClipToBounds="true" HorizontalAlignment="Left">
                                <Rectangle x:Name="Indicator" Fill="{TemplateBinding Foreground}"/>
                                <Rectangle x:Name="Animation" Fill="{TemplateBinding Foreground}" RenderTransformOrigin="0.5,0.5">
                                    <Rectangle.RenderTransform>
                                        <TransformGroup>
                                            <ScaleTransform/>
                                            <SkewTransform/>
                                            <RotateTransform/>
                                            <TranslateTransform/>
                                        </TransformGroup>
                                    </Rectangle.RenderTransform>
                                </Rectangle>
                            </Grid>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="Orientation" Value="Vertical">
                                <Setter Property="LayoutTransform" TargetName="TemplateRoot">
                                    <Setter.Value>
                                        <RotateTransform Angle="-90"/>
                                    </Setter.Value>
                                </Setter>
                            </Trigger>
                            <Trigger Property="IsIndeterminate" Value="true">
                                <Setter Property="Visibility" TargetName="Indicator" Value="Collapsed"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

What I need to do is:

Thanks in advance.

Answer 1

Catch

<Border width = "200" Height ="30" HorizontalAlignement="Left" VerticalAlign="Top"
      BorderBrush="Green" BorderThickness="1" CornerRadius="15" Margin="50,100,0,0"
    <Border Name="prog" Width="0" Height="30" BorderThickness="0" CornerRadius="15"
        HorizontalAlignment="Center" VerticalAlignment="Center">
      <Border.Background>
        <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
          <GradientStop Color="White" Ofset="0,0"></GradientStop>
          <GradientStop Color="Blue" Ofset="0,4"></GradientStop>
        </LinearGradientBrush>
      <Border.Background>
    </Border>
  </Border>