MainWindow.xaml

<Window x:Name="window" x:Class="SystrayProxyManager.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:SystrayProxyManager"
        xmlns:tb="http://www.hardcodet.net/taskbar"
        mc:Ignorable="d"
        Title="Edit proxy list" Height="200" Width="400" Visibility="Hidden" ShowInTaskbar="False" MinWidth="400" MinHeight="200" WindowStartupLocation="CenterScreen"
        Closed="Window_Closed" Closing="Window_Closing">
    <Window.Resources>
        <ItemsPanelTemplate x:Key="MainMenuStyle">
            <StackPanel Background="White"/>
        </ItemsPanelTemplate>
        <ItemsPanelTemplate x:Key="MenuProxyStyle">
            <StackPanel Background="White" Margin="-30, 0, 0, 0"/>
        </ItemsPanelTemplate>
    </Window.Resources>
    <Grid>
        <DataGrid Name="dgProxy" HorizontalAlignment="Right"
                  Height="{Binding ActualHeight, ElementName=window, Mode=OneWay}"
                  VerticalAlignment="Bottom" Width="{Binding ActualWidth,
                  ElementName=window, Mode=OneWay}" CanUserResizeRows="False" CanUserReorderColumns="False"
                  Padding="10,40,0,0" MinWidth="{Binding ActualWidth, ElementName=window,
                  Mode=OneWay}" MinHeight="{Binding ActualHeight, ElementName=window, Mode=OneWay}"
                  CanUserAddRows="True" CanUserDeleteRows="True" AutoGenerateColumns="True">
            <DataGrid.RowValidationRules>
                <local:ProxyValidationRule ValidationStep="UpdatedValue"/>
            </DataGrid.RowValidationRules>
        </DataGrid>
        <tb:TaskbarIcon x:Name="taskBarIcon" Visibility="Hidden" LeftClickCommand="{Binding TaskBarIcon_LeftClick}">
            <tb:TaskbarIcon.ContextMenu>
                <ContextMenu Name="MainMenu" Padding="0, 0, 0, 0" Background="White">
                    <ContextMenu.Style>
                        <Style TargetType="{x:Type ContextMenu}">
                            <Setter Property="ItemsPanel" Value="{StaticResource MainMenuStyle}"/>
                        </Style>
                    </ContextMenu.Style>
                    <MenuItem Header="Exit" Click="Exit_Click"/>
                    <MenuItem Header="Copyright and sources" Click="Copyright_Click"/>
                    <MenuItem Header="Show IE settings" Click="IESettings_Click"/>
                    <MenuItem Header="Clear proxy" Click="Clear_Click"/>
                    <MenuItem Name="menu_Force" Header="Force mode" Click="Force_Click" IsCheckable="True" IsChecked="False"/>
                    <MenuItem Header="Edit proxy list" Click="Edit_Click"/>
                    <MenuItem Name="menu_proxy" Header="Set proxy" ItemsSource="{Binding proxies.ValidProxy}">
                        <MenuItem.Style>
                            <Style TargetType="{x:Type MenuItem}">
                                <Setter Property="ItemsPanel" Value="{StaticResource MenuProxyStyle}"/>
                            </Style>
                        </MenuItem.Style>
                    </MenuItem>
                </ContextMenu>
            </tb:TaskbarIcon.ContextMenu>
        </tb:TaskbarIcon>
    </Grid>
</Window>