gui/OpenFaceOffline/UI_items/NumberEntryWindow.xaml

<Window x:Class="OpenFaceOffline.NumberEntryWindow"
        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="Output image size" Height="110" Width="250" ResizeMode="NoResize">
    <Grid Background="WhiteSmoke">
        <StackPanel>
            <StackPanel FocusManager.FocusedElement="{Binding ElementName=ResponseTextBox}" Orientation="Horizontal" HorizontalAlignment="Center">
                <TextBlock HorizontalAlignment="Center" Text="Output image size:" FontSize="12" VerticalAlignment="Center" Margin="0,0,10,0"/>
                <TextBox Margin="0,4,0,0" x:Name="ResponseTextBox_x" FontSize="12" Width="50" TextChanged="ResponseTextBox_TextChanged" />
                <Label>x</Label>
                <TextBox Margin="0,4,0,0" x:Name="ResponseTextBox_y" FontSize="12" Width="50" TextChanged="ResponseTextBox_TextChanged" IsEnabled="False" />
            </StackPanel>
            <Label Name="warningLabel" Visibility="Hidden"  FontStyle="Italic" Foreground="Red" HorizontalAlignment="Center" VerticalAlignment="Center">Has to be a non negative integer</Label>
            <Button Content="OK" Click="OKButton_Click" Width="50" VerticalAlignment="Bottom" HorizontalAlignment="Right"/>
        </StackPanel>
    </Grid>
</Window>