如何不为WPF指定主题并使用主机操作系统主题？

Is there a way to not specify a theme at all for WPF and just let it default to what the OS is using? I am still partial to Winforms for this reason. WinForm apps feel professional, light on its feet and part of the operating system, whereas as WPF application, including VS 2010, feel heavy. Moreover, WPF applications are visually inconsistent. They are like web pages where every developer decides what size a controls should be rather than leaving it up to the user and the operating system. I prefer to follow guidelines.Is there a way to not specify a theme at all fo