BPASmartClient/WPFDemo/Bb/Window1.xaml

<Window
    x:Class="WPFDemo.Bb.Window1"
    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:local="clr-namespace:WPFDemo.Bb"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="Window1"
    Width="800"
    Height="450"
    mc:Ignorable="d">

    <Window.DataContext>
        <local:ViewModel />
    </Window.DataContext>

    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/BPASmartClient.CustomResource;component/Themes/GenricStyle.xaml" />
                <ResourceDictionary Source="/BPASmartClient.CustomResource;component/Themes/MyStyle.xaml" />
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Window.Resources>

    <Grid>
        <local:DataGridEx ItemsSource="{Binding class1s}" />
    </Grid>
</Window>