摘要:多ResourceDictionary合併
怕忘記，記下備查。
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="aaa.xaml"/>
<ResourceDictionary Source="/YourNameSpace;component/bbb.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>