I have created a wpf control library. When I am loading the dll dynamically in codebehind the style that I have applied to the main app is not being applied to the controls in the user control. ie in my resource dictionary i have set a style for buttons that gets applied to all buttons. I want this style to be applied to the buttons in the user control as well. It works if I load the user control in the XAML, however, like I said, when I load the control in code behind it doesn't pick up the default styles of my app.