BackgroundBuilder/Views/MainWindow.xaml

<Window x:Class="BackgroundBuilder.Views.MainWindow"
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:converters="clr-namespace:BackgroundBuilder.Converters"
        Title="BackgroundBuilder" WindowStartupLocation="CenterScreen" WindowState="Maximized" MinHeight="950" MinWidth="1230">
    <Window.Resources>
        <converters:DateNoDotConverter x:Key="DateNoDotConverter" />
    </Window.Resources>
    <Grid x:Name="RootGrid" Margin="20">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        
        <!-- Row 0: Background selection -->
        <Grid Grid.Row="0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <!-- Row 2: Image-->
            <Rectangle Grid.Column="0"
                Fill="Gainsboro"
                Height="90"
                Width="160"
                >
            </Rectangle>
            <Image Source="{Binding BackgroundImage}" Height="90" Stretch="Uniform" Grid.Column="0"/>
            <Button Content="Selecionar Imagem de Fundo…" 
                    Command="{Binding SelectImageCommand}" 
                    Grid.Column="1" 
                    Padding="20,3,20,3"
                    Height="30"
                    Margin="5"/>
            <TextBox Text="{Binding CaminhoBGImage}"
                     Grid.Column="2" 
                     IsReadOnly="True"
                     Padding="20,3,20,3"
                     Height="30"
                     Margin="5"/>
        </Grid>
        
        <!-- Row 1: three side-by-side DataGrids -->
        <Grid Grid.Row="1" HorizontalAlignment="Right" VerticalAlignment="Bottom">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>


            <Grid Grid.Column="0" x:Name="MainGrid" HorizontalAlignment="Right" VerticalAlignment="Bottom">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                </Grid.ColumnDefinitions>

                <!-- Comando -->
                <DataGrid Grid.Column="0"
                          ItemsSource="{Binding Comando}"
                          AutoGenerateColumns="False"
                          CanUserAddRows="False">
                    <DataGrid.Columns>
                        <DataGridTextColumn Header="Ação" Binding="{Binding Nome}"/>
                        <DataGridTextColumn Header="Ramal" Binding="{Binding Ramal}"/>
                    </DataGrid.Columns>
                </DataGrid>
                <!-- ContatosSemCMD -->
                <DataGrid Grid.Column="1"
                          ItemsSource="{Binding ContatosSemCMD}"
                          AutoGenerateColumns="False"
                          CanUserAddRows="False">
                    <DataGrid.Columns>
                        <DataGridTextColumn Header="Nome" Binding="{Binding Nome}"/>
                        <DataGridTextColumn Header="Email" Binding="{Binding Email}"/>
                        <DataGridTextColumn Header="Ramal" Binding="{Binding Ramal}"/>
                        <DataGridTextColumn Header="Área" Binding="{Binding Area}"/>
                    </DataGrid.Columns>
                </DataGrid>
                <!-- Aniversarios -->
                <DataGrid Grid.Column="2"
                          ItemsSource="{Binding Aniversarios}"
                          AutoGenerateColumns="False"
                          CanUserAddRows="False">
                    <DataGrid.Columns>
                        <DataGridTextColumn Header="Nome" Binding="{Binding Nome}"/>
                        <DataGridTextColumn Header="Aniversário"
                                            Binding="{Binding Aniversario,Converter={StaticResource DateNoDotConverter}}"/>
                    </DataGrid.Columns>
                </DataGrid>
            </Grid>

            <!-- Row 3: DataGrid for RawContatos -->
            <DataGrid x:Name="RawGrid"
                    Grid.Column="2"
                    ItemsSource="{Binding RawContatos}"
                    SelectedItem="{Binding SelectedContato}"
                    AutoGenerateColumns="False"
                    IsReadOnly="False"
                    IsHitTestVisible ="True"
                    FontSize="11"
                    VerticalAlignment="Top"
                    HorizontalAlignment="Center"
                    Height="800"
                    AlternatingRowBackground="DarkGray">
                <DataGrid.ColumnHeaderStyle>
                    <Style TargetType="DataGridColumnHeader">
                        <Setter Property="HorizontalContentAlignment" Value="Center"/>
                        <Setter Property="Background" Value="Gray"/>
                        <Setter Property="Foreground" Value="White"/>
                        <Setter Property="Padding" Value="5"/>
                        <Setter Property="HorizontalAlignment" Value="Stretch"/>
                    </Style>
                </DataGrid.ColumnHeaderStyle>
                <!-- your existing columns here -->
                <DataGrid.Columns>
                    <DataGridTextColumn Header="Ramal"   Binding="{Binding Ramal, UpdateSourceTrigger=PropertyChanged}" />
                    <DataGridTextColumn Header="Nome"    Binding="{Binding Nome, UpdateSourceTrigger=PropertyChanged}" />
                    <DataGridTextColumn Header="Email"   Binding="{Binding Email, UpdateSourceTrigger=PropertyChanged}" />
                    <DataGridTextColumn Header="Área"    Binding="{Binding Area, UpdateSourceTrigger=PropertyChanged}" />
                    <DataGridTemplateColumn Header="Aniversário">
                        <DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <DatePicker SelectedDate="{Binding Aniversario, UpdateSourceTrigger=PropertyChanged}"/>
                            </DataTemplate>
                        </DataGridTemplateColumn.CellTemplate>
                    </DataGridTemplateColumn>
                    <DataGridCheckBoxColumn Header="É Comando?" Binding="{Binding IsComando}" />

                </DataGrid.Columns>
            </DataGrid>
        </Grid>

        <!-- Row 3: Buttons for actions -->
        <Grid Grid.Row="3"
              Margin="5">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button Content="Recarregar Contatos"
                    Command="{Binding RefreshCommand}"
                    Grid.Column="0"
                    FontWeight="Medium"
                    Padding="5"
                    Margin="5"/>
            <Button Content="+ Nova linha" 
                    Command="{Binding AddCommand}" 
                    Grid.Column = "1"
                    Foreground="Green"
                    FontWeight="Medium"
                    Padding="5"
                    Margin="5"/>
            <Button Content="- Deletar selecionada" 
                    Command="{Binding DeleteCommand}"
                    Grid.Column = "2"
                    Foreground="Red" 
                    FontWeight="Medium"
                    Padding="5"
                    Margin="5"/>
            <Button Content="Salvar dados" 
                    Command="{Binding UpdateCommand}"
                    CommandParameter="RawGrid"
                    Grid.Column = "3" 
                    FontWeight="Medium"
                    Padding="5"
                    Margin="5"/>
            <Button Content="Criar Imagem -->" 
                    Command="{Binding ExportImageCommand}" 
                    CommandParameter="MainGrid"
                    Grid.Column = "4"
                    Foreground="Blue"
                    FontWeight="Bold"
                    Padding="5"
                    Margin="5"/>
        </Grid>
    </Grid>
</Window>