WPF

   <Grid>

        <StackPanel>

            <TextBlock>My UI</TextBlock>

            <ListBox>

                <ListBoxItem>Item 1</ListBoxItem>

                <ListBoxItem>Item 2</ListBoxItem>

            </ListBox>

            <RichTextBox>  </RichTextBox>

        </StackPanel>

    </Grid>  

        <Border BorderBrush="Black" BorderThickness="5" Margin="10" Padding="5">

            <Button>Click Me!</Button>

        </Border>

    </Grid> 

  <Grid>

        <Ellipse Width="200" Height="150">

            <Ellipse.Fill>

                <LinearGradientBrush>

                    <GradientStop Offset="0" Color="Teal"/>

                    <GradientStop Offset="1" Color="Aqua"/>

                </LinearGradientBrush>

            </Ellipse.Fill>

        </Ellipse>