Use Kaxaml instead of the XAMLPad
Kaxaml is a nice looking lightweight XAML editor, which features intellisense and live preview of your XAML files. It offers a split view, similar to XAMLPad, included in the Windows SDK. It igves you a chance to play with XAML without downloading the SDK, although for anything serious I would use you Visual Studio. Here is a screenshot to spice your appetite:
