<Button x:Class="BluetoothPC.SuperButton"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:BluetoothPC"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Button.Template>
        <ControlTemplate TargetType="Button">
            <Grid ClipToBounds="True" Background="{TemplateBinding Background}" MouseLeftButtonDown="Grid_MouseLeftButtonDown">
                <Border BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="0" CornerRadius="30,30,30,30">
                    <Border.Background>
                        <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                            <GradientStop Offset="0.1" Color="#FF65E8D7" />
                            <GradientStop Offset="0.5" Color="#FFACF6F7" />
                            <GradientStop Offset="0.0" Color="#FF49FCFF" />
                        </LinearGradientBrush>
                    </Border.Background>
                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Content="{TemplateBinding ContentControl.Content}"/>
                </Border>
                <Path Fill="White" Name="MyPath">
                    <Path.Data>
                        <EllipseGeometry x:Name="MyEllipse" RadiusX="0" RadiusY="{Binding RelativeSource={RelativeSource Mode=Self},Path=RadiusX}">

                        </EllipseGeometry>
                    </Path.Data>
                </Path>
            </Grid>
        </ControlTemplate>
    </Button.Template>
</Button>