kmpdfkit_demo/Demo/Examples/Compdfkit_Tools/Annotation/PDFAnnotationPanel/PDFAnnotationControl/CPDFAnnotationControl.xaml

<UserControl x:Class="Compdfkit_Tools.PDFControl.CPDFAnnotationControl"
             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.PDFControlUI"
             mc:Ignorable="d" 
             Loaded="AnnotationControl_Loaded"
             Unloaded="AnnotationControl_Unloaded"
             d:DesignHeight="800" d:DesignWidth="300">
    <Grid>
        <Border x:Name="AnnotationPanelContainer" Background="#FAFCFF"></Border>
        <TextBlock x:Name="EmptyMessage" Text="The property panel is empty." VerticalAlignment="Center" HorizontalAlignment="Center"></TextBlock>
    </Grid>
</UserControl>