<ControlTemplate TargetType="{x:Type Button}">
                        <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="{Binding CornerRadius, RelativeSource={RelativeSource TemplatedParent}}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                            <ContentPresenter x:Name="contentPresenter" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsDefaulted" Value="true">
                                <Setter Property="BorderBrush" TargetName="border" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="true">
                                <Setter Property="Background" TargetName="border" Value="{StaticResource Button.MouseOver.Background}"/>
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.MouseOver.Border}"/>
                            </Trigger>
                            <Trigger Property="IsPressed" Value="true">
                                <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Pressed.Background}"/>
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Pressed.Border}"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Background" TargetName="border" Value="{StaticResource Button.Disabled.Background}"/>
                                <Setter Property="BorderBrush" TargetName="border" Value="{StaticResource Button.Disabled.Border}"/>
                                <Setter Property="TextElement.Foreground" TargetName="contentPresenter" Value="{StaticResource Button.Disabled.Foreground}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

public class ButtonAssist : Button
    {
        public static readonly DependencyProperty CornerRadiusKey =
            DependencyProperty.Register("CornerRadius", typeof(CornerRadius), typeof(ButtonAssist), new PropertyMetadata(new CornerRadius(5)));

        public CornerRadius CornerRadius
        {
            get { return (CornerRadius)GetValue(CornerRadiusKey); }
            set { SetValue(CornerRadiusKey, value); }
        }
    }
1
2
3
4
5
6
7
8
9
10
11

 <Style x:Key="Mybutton" TargetType="local:ButtonAssist" BasedOn="{StaticResource ButtonAss}">
            <Setter Property="CornerRadius" Value="20"/>
        </Style>
1
2
3