rkismvvm/rkismvvm/Views/MenuWindow.xaml

<Window x:Class="rkismvvm.Views.MenuWindow"
        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"
        mc:Ignorable="d"
        Title="Menu" Height="400" Width="400">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="50*"/>
            <RowDefinition Height="10*"/>
            <RowDefinition Height="50*"/>
            <RowDefinition Height="10*"/>
            <RowDefinition Height="50*"/>

        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="50*"/>
            <ColumnDefinition Width="10*"/>
            <ColumnDefinition Width="50*"/>
            <ColumnDefinition Width="10*"/>
            <ColumnDefinition Width="50*"/>
        </Grid.ColumnDefinitions>
        <Button Grid.Row="2" Grid.Column="0" Content="Профиль" FontSize="16" Command="{Binding OpenProfile}"/>
        <Button Grid.Row="2" Grid.Column="2" Content="Пользователи"  FontSize="16" Command="{Binding OpenUsers}"/>
        <Button Grid.Row="2" Grid.Column="4" Content="Задачи" FontSize="16" Command="{Binding OpenTasks}" />
        <Button Grid.Row="5" Grid.Column="4" Content="Мои Задачи" FontSize="16" Command="{Binding OpenMyTask}" />
        <Button Grid.Row="5" Grid.Column="2" Content="История задач" FontSize="16" Command="{Binding OpenTaskHistory}" />
        <Button Grid.Row="5" Grid.Column="0" Content="Создать отчет" FontSize="16" Command="{Binding CreateReport}" />
    </Grid>
</Window>