Dialog.xaml

<Window x:Class="LifeRunner.Dialog"
        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:LifeRunner"
        mc:Ignorable="d"
        Title="Dialog" Height="150" Width="200">
    <Grid Background="#FFD8D4D4">
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <TextBox x:Name="Text" Text="Enter text" VerticalAlignment="Center" HorizontalAlignment="Center" FontSize="14"/>
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <Button Content="OK" Grid.Column="1" Width="50" Height="25" Click="Button_Click" Background="White" Opacity="0.5"/>
        </Grid>
    </Grid>
</Window>