单项选择题 Where can you check the value of a dependency property? （）

单项选择题 Which of the following examples of the pack URI syntax accesses a file named myImage.jpg in a folder named MyFolder in another assembly named myAssembly? （）

单项选择题 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? （）