<Button Style="{StaticResource squareStyle}" Command="{Binding PutStone}">
                                    <Button.Template>
                                        <ControlTemplate TargetType="{x:Type Button}">
                                            <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" Background="{TemplateBinding Background}">
                                                <ContentPresenter />
                                            </Border>
                                            <ControlTemplate.Triggers>
                                                <Trigger Property="IsMouseOver" Value="True">
                                                    <Setter TargetName="border" Property="Background" Value="#AAF" />
                                                </Trigger>
                                                <Trigger Property="IsEnabled" Value="False">
                                                    <Setter TargetName="border" Property="Background" Value="#844" />
                                                </Trigger>
                                            </ControlTemplate.Triggers>
                                        </ControlTemplate>
                                    </Button.Template>
                                        <Ellipse Style="{StaticResource ellipseStyle}" Fill="{Binding Owner.Value, Converter={StaticResource ownerConverter} }"/>
                                </Button>