MVVM for Multi Platforms

<Window x:Class="GeographicRepresentation.UILib.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    xmlns:local="clr-namespace:GeographicRepresentation.UILib.View"
    xmlns:me="clr-namespace:GeographicRepresentation.UILib"    
    Title="Geographic representation" WindowState="Maximized"
    Loaded="Window_Loaded">
    <Grid>
        <Grid.Resources>
            <ResourceDictionary>
                <ResourceDictionary.MergedDictionaries>
                    <ResourceDictionary Source="View/CommonViewDictionary.xaml" />
                </ResourceDictionary.MergedDictionaries>            
                <Style TargetType="{x:Type Button}">
                    <Setter Property="Margin" Value="20,10,20,10" />
                    <Setter Property="Height" Value="30" />
                    <Setter Property="Width" Value="45" />
                    <Setter Property="HorizontalAlignment" Value="Left" />                
                </Style>
                <Style TargetType="{x:Type TextBlock}" BasedOn="{StaticResource textBlockStyle}" />
            </ResourceDictionary>
        </Grid.Resources>
        <Grid.RowDefinitions>
            <RowDefinition Height="100" />
            <RowDefinition Height="*" />
            <RowDefinition Height="30" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="300" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <DockPanel Background="LightGray" Grid.Column="0" Grid.ColumnSpan="2" Grid.Row="0">            
            <Menu Height="30" Width="45" HorizontalAlignment="Left" Margin="20,10,20,10">
                <MenuItem Height="30" 
                          HorizontalAlignment="Stretch" 
                          >
                    <MenuItem.HeaderTemplate>
                        <DataTemplate>
                            <DockPanel>
                                <TextBlock Text="New" VerticalAlignment="Center" />
                                <Canvas Height="10" Width="10">                                    
                                    <Polygon Points="1,3 10,3, 5,10" Fill="Black" />
                                </Canvas>
                            </DockPanel>
                        </DataTemplate>
                    </MenuItem.HeaderTemplate>
                    <MenuItem Header="Continent" Command="me:MainWindow.cmd_AddContinent" />
                    <MenuItem Header="Country" Command="me:MainWindow.cmd_AddCountry" />
                    <MenuItem Header="City" Command="me:MainWindow.cmd_AddCity" />
                </MenuItem>
            </Menu>
            <Button Content="Edit" Command="me:MainWindow.cmd_EditObject" />
            <Button Content="Delete" Command="me:MainWindow.cmd_RemoveObject" />
        </DockPanel>
        <local:ContinentsViewGrid x:Name="treeView" Grid.Column="0" Grid.Row="1" />  
        <local:SelectedObjectView Grid.Column="1" Grid.Row="1" DataContext="{Binding ElementName=treeView, Path=SelectedObject}" />
        <TextBlock x:Name="txtCurrentTime"
                   Text="{Binding Path=CurrentTime}" 
                   Grid.Row="2" Grid.Column="1"
                   HorizontalAlignment="Right"
                   VerticalAlignment="Bottom"/>
    </Grid>
</Window>