sourcegit/src/UI/AddSubmodule.xaml

<UserControl x:Class="SourceGit.UI.AddSubmodule"
             x:Name="me"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:helpers="clr-namespace:SourceGit.Helpers"
             mc:Ignorable="d" 
             d:DesignHeight="192" d:DesignWidth="500" Height="192" Width="500">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="32"/>
            <RowDefinition Height="16"/>
            <RowDefinition Height="32"/>
            <RowDefinition Height="32"/>
            <RowDefinition Height="32"/>
            <RowDefinition Height="16"/>
            <RowDefinition Height="32"/>
        </Grid.RowDefinitions>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="150"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>

        <Label Grid.Row="0" Grid.ColumnSpan="2" FontWeight="DemiBold" FontSize="18" Content="Add Submodule"/>

        <Label Grid.Row="2" Grid.Column="0" HorizontalAlignment="Right" Content="URL :"/>
        <TextBox x:Name="txtRepoUrl" Grid.Row="2" Grid.Column="1" 
                 Height="24"
                 helpers:TextBoxHelper.Placeholder="Git Repository URL">
            <TextBox.Text>
                <Binding Path="RepoURL" ElementName="me" UpdateSourceTrigger="PropertyChanged" Mode="TwoWay">
                    <Binding.ValidationRules>
                        <helpers:RemoteUriRule/>
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>

        <Label Grid.Row="3" Grid.Column="0" HorizontalAlignment="Right" Content="Parent Folder :"/>
        <TextBox Grid.Row="3" Grid.Column="1"
                 x:Name="txtPath"
                 Height="24"
                 helpers:TextBoxHelper.Placeholder="Relative foler to store this module. Optional.">
            <TextBox.Text>
                <Binding Path="LocalPath" ElementName="me" UpdateSourceTrigger="PropertyChanged" Mode="TwoWay">
                    <Binding.ValidationRules>
                        <helpers:SubmodulePathRequiredRule/>
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>

        <CheckBox Grid.Row="4" Grid.Column="1"
                  x:Name="chkRecursive"
                  IsChecked="True"
                  Content="Fetch nested submodules"/>

        <Grid Grid.Row="6" Grid.ColumnSpan="2">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="80"/>
                <ColumnDefinition Width="8"/>
                <ColumnDefinition Width="80"/>
            </Grid.ColumnDefinitions>

            <Button Grid.Column="1" Click="Sure" Content="SURE" Style="{StaticResource Style.Button.AccentBordered}"/>
            <Button Grid.Column="3" Click="Cancel" Content="CANCEL" Style="{StaticResource Style.Button.Bordered}"/>
        </Grid>
    </Grid>
</UserControl>