How to have insert/remove WPF grid row/column in context menu in design mode?

In the m开发者_如何学Goachine at the office my Visual Studio 2010 has the context menu to insert/remove row/colunm from a grid which is very convenient compared to manually insert - requires to update every each of the current row/column indexes.

But at home, my IDE doesn't have this menu. I don't know how to have this context menu Grid Row and Grid Column.

Update

My VS version at home

My VS version at office

go to silverlight.net, click the getting started link, and download the latest version of Silverlight Tools for Visual Studio 2010. This is for the WPF designer too.

I'm guessing you might not have the same version of Visual Studio?

Can you compare them? Not just if it's both 2010. In any case: My Premium version at work definately also has it.