Zachet/DB/MainWindow.xaml

<Window x:Class="DB.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:DB"
        mc:Ignorable="d"
        Title="Подготовка" Height="450" Width="800" Icon="Images/Icon.jpg">
    <Grid>
        <Frame Name="mainFrame" NavigationUIVisibility="Hidden">
            
        </Frame>
    </Grid>
</Window>