PlanNameWindow.xaml

<Window x:Class="EQD2Converter.PlanNameWindow"
        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:EQD2Converter"
        mc:Ignorable="d"
        Title="PlanNameWindow" Height="162" Width="350" WindowStartupLocation="CenterScreen" Background="AliceBlue">
    <Window.Resources>
        <Style TargetType="{x:Type Button}"/>
        <Style TargetType="{x:Type Label}"/>
        <Style TargetType="{x:Type Border}"/>
        <Style TargetType="{x:Type TextBox}"/>
    </Window.Resources>
    <Grid>
        <Label Content="Plan name:" HorizontalAlignment="Left" Margin="23,25,0,0" VerticalAlignment="Top"/>
        <TextBox x:Name="PlanNameTextBox" HorizontalAlignment="Left" Margin="100,25,0,0" VerticalAlignment="Top" VerticalContentAlignment="Center" Height="26" Width="150"  MaxLength="16" TextChanged="IsPlanNameAvailable"/>
        <Button x:Name="OKbutton"  Content="OK" HorizontalAlignment="Left" Margin="75,80,0,0" VerticalAlignment="Top" Width="80" Height="30" IsDefault="True" Click="Button_Click"/>
        <Button Content="Cancel" HorizontalAlignment="Left" Margin="190,80,0,0" VerticalAlignment="Top" Width="80" Height="30" IsCancel="True" Click="Button_Click_1"/>
        <Label x:Name="PlanNameTextBoxSuccess" Content="" HorizontalAlignment="Left" Margin="260,25,0,0" VerticalAlignment="Top"/>
    </Grid>
</Window>