You are developing a Windows Presentation Foundation (WPF) application. You need to use XAML to create a custom control that contains two Button controls.
From which base class should you inherit? （）

You use Microsoft .Net Framework 4 to create a Windows Form application.
You created a new application, you then wrote the code below:
Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture
Which of the following options are TRUE? （）

You are developing a Windows Presentation Foundation (WPF) application.
The application contains stylized body text and heading text. The heading text is a slight variation of the body text.
You need to ensure that if the body text changes, the heading text automatically inherits those changes.
What should you do ?（）

You are developing a Windows Presentation Foundation (WPF) application. All of the application styles are in the file name Themes.dll
You have the followiing markup segment.

BlueBackground is defined in a XAML file named BlueTheme.xaml. The XAML markup is compiled into the Themes.dll file.
You need to ensure that the XAML file is referenced so that the application can apply the settings in the BlueBackground style.（）