ReversiBoard2

<UserControl x:Class="ReversiGUI.ReversiBoard"
             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:ReversiGUI"
             mc:Ignorable="d"
             d:DesignHeight="150" d:DesignWidth="150">

    <UserControl.Resources>
        <local:PlayerToColorTilesConvertor x:Key="PlayerToColorTilesConvertor" />

        <Style TargetType="Button" x:Key="MyButton2">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Border Background="{TemplateBinding Background}">
                            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Background" Value="Transparent"/>
                    <Setter Property="BorderBrush" Value="Black" />
                    <Setter Property="BorderThickness" Value="1" />
                </Trigger>
            </Style.Triggers>
        </Style>

    </UserControl.Resources>
    <Viewbox Stretch="Uniform">
        <ItemsControl Name="Items" VerticalAlignment="Center" HorizontalAlignment="Center" ItemsSource="{Binding GridViewModel}" Background="Transparent">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Vertical"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <ItemsControl ItemsSource="{Binding .}">
                        <ItemsControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <StackPanel Orientation="Horizontal" />
                            </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <Button Style="{StaticResource MyButton2}" Command="{Binding PlaceStoneCommand}" Background="Transparent" BorderBrush="Black" BorderThickness="0.75"  Width="30" Height="30">
                                    <Ellipse Width="20" Height="20" Stretch="UniformToFill">
                                        <Ellipse.Fill>
                                            <SolidColorBrush Color="{Binding ColorCell.Value, Converter={StaticResource PlayerToColorTilesConvertor}}"/>
                                        </Ellipse.Fill>
                                    </Ellipse>
                                </Button>
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </Viewbox>
</UserControl>