Markus,
you propably should ask Microsoft on that one.
Nevertheless, there is an easy way to solve this: I think that you already use ActiveX to communicate with Excel. If you want to change properties of Excelsheets via ActiveX, the best solution is:
Create a makro (using the recording functionality of Excel) which does exactly the desired and then port the makro to LabVIEW......
hope this helps,
Norbert B.
Norbert
----------------------------------------------------------------------------------------------------
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.