sourcegit/UI/GitFlowStartBranch.xaml

<UserControl x:Class="SourceGit.UI.GitFlowStartBranch"
             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="160" d:DesignWidth="500" Height="128" Width="500">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="32"/>
            <RowDefinition Height="16"/>
            <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" x:Name="txtTitle" FontWeight="DemiBold" FontSize="18"/>

        <Label Grid.Row="2" Grid.Column="0" x:Name="txtPrefix" HorizontalAlignment="Right" FontSize="16" VerticalAlignment="Center"/>
        <TextBox Grid.Row="2" Grid.Column="1" x:Name="txtName" VerticalContentAlignment="Center" helpers:TextBoxHelper.Placeholder="Enter name" Height="24">
            <TextBox.Text>
                <Binding ElementName="me" Path="SubName" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">
                    <Binding.ValidationRules>
                        <helpers:BranchNameRule x:Name="nameValidator"/>
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>

        <Grid Grid.Row="4" 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 Grid.Row="0" Grid.RowSpan="5" Grid.ColumnSpan="2" x:Name="status" Visibility="Collapsed" Background="{StaticResource Brush.BG1}" Opacity=".9">
            <Path x:Name="statusIcon" Width="48" Height="48" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Loading}" RenderTransformOrigin=".5,.5">
                <Path.RenderTransform>
                    <RotateTransform Angle="0"/>
                </Path.RenderTransform>
            </Path>
        </Grid>
    </Grid>
</UserControl>