ShanXi_SmartControl/GDNXFD.Alert.Config/Resources/Common/ItemsPanel.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ItemsPanelTemplate x:Key="HorizontalItemsPanel">
        <StackPanel Orientation="Horizontal"/>
    </ItemsPanelTemplate>
</ResourceDictionary>