WPF XAML CODE FOR BALL(BUBBLE)--------MAINWINDOW.XAML

 <Grid>
        <DockPanel>
            <Ellipse Width="200" Height="200" Name="MyEllipse">
                <Ellipse.Fill>
                    <RadialGradientBrush >
                        <GradientStop Offset="0" Color="#CCCCCCCC" />
                        <GradientStop Offset="0.5" Color="white" />
                        <GradientStop Offset="1" Color="black"/>
                    </RadialGradientBrush >
                </Ellipse.Fill>
            </Ellipse>
            <DockPanel.Triggers>
                <EventTrigger RoutedEvent="Page.Loaded">
                    <BeginStoryboard Name="MyBeginStoryBoard">
                        <Storyboard Name="MyStoryBoard">
                            <DoubleAnimation Storyboard.TargetName="MyEllipse" Storyboard.TargetProperty="(Ellipse.Height)"
               From="0" To="200" AutoReverse="true" RepeatBehavior="Forever"
             BeginTime="0:0:0" />
                            <DoubleAnimation Storyboard.TargetName="MyEllipse" Storyboard.TargetProperty="(Ellipse.Width)"
               From="0" To="200" AutoReverse="true"
               RepeatBehavior="Forever" BeginTime="0:0:0" />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </DockPanel.Triggers>
        </DockPanel>

    </Grid>

OUTPUT: