单选题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? （）AFrameworkElementBUIElementCUserControlDButton
单选题
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? （）
A
FrameworkElement
B
UIElement
C
UserControl
D
Button
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