MainWindow.xaml

<Window x:Class="EnumSharpIntegrator.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:EnumSharpIntegrator"
        mc:Ignorable="d"
        Title="EnumSharpIntegrator" Height="450" Width="600">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="0.2*" />
            <RowDefinition Height="0.2*" />
            <RowDefinition Height="0.2*" />
            <RowDefinition Height="0.2*" />
            <RowDefinition Height="0.2*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="0.25*" />
            <ColumnDefinition Width="0.5*" />
            <ColumnDefinition Width="0.25*" />
        </Grid.ColumnDefinitions>

        <StackPanel Grid.Row="1" Grid.Column="1" Margin="20">
            <TextBlock Text="Target file:" FontWeight="DemiBold"/>
            <DockPanel>
                <TextBox x:Name="TxtTargetPath" Width="200" />
                <Button Content="..." Margin="4 0 0 0" Click="BtnTargetPath_Click" />
            </DockPanel>
        </StackPanel>

        <StackPanel Grid.Row="2" Grid.Column="1" Margin="20">
            <TextBlock Text="Integrated file:" FontWeight="DemiBold"/>
            <DockPanel>
                <TextBox x:Name="TxtFilePath" Width="200" />
                <Button Content="..." Margin="4 0 0 0" Click="BtnFilePath_Click" />
            </DockPanel>
        </StackPanel>

        <StackPanel Grid.Row="3" Grid.Column="1" Margin="20" VerticalAlignment="Center">
            <Button x:Name="MergeBtn" 
                    Background="BlueViolet" 
                    Foreground="White" 
                    FontWeight="Bold" 
                    Content="MERGE" 
                    Margin="4 0 0 0" 
                    BorderBrush="Black"
                    BorderThickness="2"
                    Click="BtnMerge_OnClick" />
        </StackPanel>

        <StackPanel x:Name="spAlert" 
                    Grid.Row="4"
                    Grid.Column="1"
                    Background="#cd5d5d" 
                    Visibility="Hidden" 
                    Width="300" 
                    Height="45">
            <TextBlock x:Name="tbAlert"
                       FontWeight="Bold"
                       FontSize="15"
                       TextWrapping="Wrap"
                       VerticalAlignment="Center"
                       Foreground="White"
                       Margin="10 8 10 10" HorizontalAlignment="Center"/>
        </StackPanel>
        <ProgressBar x:Name="ProgressBar" 
                     Maximum="100"
                     BorderThickness="2" 
                     Grid.Column="1" 
                     HorizontalAlignment="Left" 
                     Height="10" 
                     Margin="66,64,0,0" 
                     Grid.Row="3" 
                     VerticalAlignment="Top" 
                     Width="169"/>
    </Grid>
</Window>