kmpdfkit_demo/Demo/Examples/Compdfkit_Tools/Form/Property/SignatureProperty.xaml

<UserControl x:Class="Compdfkit_Tools.PDFControl.SignatureProperty"
             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:local="clr-namespace:Compdfkit_Tools.PDFControl"
             mc:Ignorable="d" 
             Loaded="UserControl_Loaded"
             Unloaded="UserControl_Unloaded"
             >
    <UserControl.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="../../Asset/Styles/ComboBoxStyle.xaml"></ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </UserControl.Resources>
    <Grid Background="White">
        <Grid.RowDefinitions>
            <RowDefinition Height="40"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Border BorderThickness="0" BorderBrush="#1A000000">
            <Grid  Height="40" Background="White" >
                <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="Signature" FontSize="14" FontFamily="Segoe UI" FontWeight="Bold"/>
            </Grid>
        </Border>
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="16"/>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="16"/>
            </Grid.ColumnDefinitions>

            <StackPanel Grid.Column="1">
                <TextBlock Margin="0,20,0,0" HorizontalAlignment="Left" VerticalAlignment="Top" Text="Form Field" FontSize="14" FontFamily="Segoe UI" FontWeight="Bold"/>
                <ComboBox x:Name="FormFieldCombox" Margin="0,8,0,0" Style="{StaticResource ComboBoxStyle1}" SelectedIndex="0" SelectionChanged="FormFieldCombox_SelectionChanged">
                    <ComboBoxItem Content="Visible"/>
                    <ComboBoxItem Content="Hidden"/>
                    <ComboBoxItem Content="Visible but doesn't print"/>
                    <ComboBoxItem Content="Hidden but printable"/>
                </ComboBox>
            </StackPanel>
        </Grid>
    </Grid>
</UserControl>