I'm using SSRS 2012 trying to do the following:

Some columns should only be visible on user request, using a combo box. Visibility of the columns dependes on the selected columns on the combo. This seems to work fine!

When I export the output in any format different of .csv these columns remain invisible. But when exporting to .csv invisible coulmns are shown.

I found this:

```
=iif(Globals!RenderFormat.Name="CSV", True, False)

```

This should be placed in the "Hidden" property of the column I'm trying to hide. But it doesn't work and when I write the expression RenderFormat is not an option as auto-complete.

Sorry for my clumsy english and thanks.