I want a layout like VS 2008. In which I want two columns and second columns is again split into two.
I done that in the xaml mentioned below, but the GridSplitter
Your gridsplitter is behind the other controls that's why you can't see it. You can either move it to the bottom in your XAML file (so it is added last) or use the Panel.ZIndex attached property. Additionally you have to set the width for the splitter correctly correctly:
Left Hand Side
Hello
World
Hello
World