WpfCrossButton.xaml

<Button Width="15" Height="15" Panel.ZIndex="999" VerticalAlignment="Top" HorizontalAlignment="Right" Padding="5">
                                    <Button.Template>
                                        <ControlTemplate TargetType="Button">
                                            <Grid Background="Transparent">
                                                <!-- The background of the button, as an ellipse. -->
                                                <Ellipse x:Name="backgroundEllipse" />

                                                <!-- A path that renders a cross. -->
                                                <Path x:Name="ButtonPath"
                                                  Margin="3"
                                                  Stroke="#FFff5555"
                                                  StrokeThickness="2"
                                                  StrokeStartLineCap="Square"
                                                  StrokeEndLineCap="Square"
                                                  Stretch="Uniform"
                                                  VerticalAlignment="Center"
                                                  HorizontalAlignment="Center">
                                                    <Path.Data>
                                                        <PathGeometry>
                                                            <PathGeometry.Figures>
                                                                <PathFigure StartPoint="0,0">
                                                                    <LineSegment Point="25,25"/>
                                                                </PathFigure>
                                                                <PathFigure StartPoint="0,25">
                                                                    <LineSegment Point="25,0"/>
                                                                </PathFigure>
                                                            </PathGeometry.Figures>
                                                        </PathGeometry>
                                                    </Path.Data>
                                                </Path>
                                            </Grid>
                                            <ControlTemplate.Triggers>
                                                <Trigger Property="IsMouseOver" Value="True">
                                                    <Setter TargetName="backgroundEllipse" Property="Fill"
                                                        Value="#FFc13535" />
                                                    <Setter TargetName="ButtonPath" Property="Stroke" 
                                                        Value="#FFf9ebeb"/>
                                                    <Setter Property="Cursor" Value="Hand" />
                                                    <Setter Property="Focusable" Value="False" />
                                                </Trigger>
                                                <Trigger Property="IsEnabled" Value="False">
                                                    <Setter Property="Visibility" Value="Collapsed"/>
                                                </Trigger>

                                            </ControlTemplate.Triggers>
                                        </ControlTemplate>
                                    </Button.Template>
                                </Button>