kmpdfkit_demo/Demo/Examples/PDFViewer/App.xaml

<Application x:Class="PDFViewer.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:cpdfcommon="clr-namespace:Compdfkit_Tools.Common;assembly=Compdfkit_Tools"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <cpdfcommon:WindowStateToThicknessConverter x:Key="WindowStateToThicknessConverter"></cpdfcommon:WindowStateToThicknessConverter>
        <cpdfcommon:CaptionHeightConverter x:Key="CaptionHeightConverter"></cpdfcommon:CaptionHeightConverter>
        <cpdfcommon:WindowStateToPathConverter x:Key="WindowStateToPathConverter"></cpdfcommon:WindowStateToPathConverter>
    </Application.Resources>
</Application>