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

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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.

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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.