For the button to appear (written from the point of view of Visual Studio 2005, but probably the same, or at least very similar to Visual Studio 2008):
Right-click somewhere in the Visual Studio toolbar and select "Customize ...", then on the "Commands" tab in the "Categories" list, select "Build".
You should now have a list of Build commands in the Commands list, one of which should be Batch Build .... Drag it somewhere to the toolbar.
However, I'm not sure if batch assemblies are supported for Visual Basic, so I'm not sure if this will help you.
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