InputBox.xaml

<Window x:Class="NotepadWPF.InputBox"
        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:NotepadWPF"
        mc:Ignorable="d"
        Title="Input Box" SizeToContent="WidthAndHeight" 
        WindowStartupLocation="CenterScreen">
    <Grid Margin="15">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Label Name="QuestionLabel" Grid.Column="1"></Label>
        <TextBox Name="AnswerTextBox" Height="25" Grid.Column="1" Grid.Row="1" MinWidth="300" />
        <WrapPanel Grid.Row="2" Grid.ColumnSpan="2" HorizontalAlignment="Right" Margin="0,15,0,0">
            <Button IsDefault="True" Name="OKButton" Height="Auto" MinWidth="60" Margin="0,0,10,0" Content="_OK" Click="OKButton_Click" />
            <Button IsCancel="True" Height="35" MinWidth="60" Content="_Cancel" />
        </WrapPanel>
    </Grid>
</Window>