3rdpartylibs/fastreports.wpf/Demos/WPF/CustomDesigner/MainWindow.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:CustomDesigner"
        xmlns:Design="clr-namespace:FastReport.Design;assembly=FastReport.WPF" x:Class="CustomDesigner.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="800" Width="1200" UseLayoutRounding="True">
    <DockPanel>
        <StackPanel Orientation="Horizontal" Height="40" DockPanel.Dock="Top">
            <Button Content="Open" Command="{Binding ElementName=designer,Path=cmdOpen}" Margin="10,10,5,10"/>
            <Button Content="Save" Command="{Binding ElementName=designer,Path=cmdSave}" Margin="5,10,5,10"/>
            <Button Content="New Page" Command="{Binding ElementName=designer,Path=cmdNewPage}" Margin="5,10,5,10"/>
            <Button Content="New Dialog" Command="{Binding ElementName=designer,Path=cmdNewDialog}" Margin="5,10,5,10"/>
            <Button Content="Delete Page" Command="{Binding ElementName=designer,Path=cmdDeletePage}" Margin="5,10,5,10"/>
        </StackPanel>
        <Design:WpfDesignerControl x:Name="designer"/>
    </DockPanel>
</Window>