CP9 - custom zoom level when authoring??

I sometimes build charts/graphics in Captivate that I use in my courses. However, I need to resize the screen area to take a screenshot. However, the zoom levels are preset (via the very top bar of the Captivate interface on the far right) to 25,33,50,66,75,100, etc.  Is there any way to specify a custom zoom level?  I don't want to jump over to another app to re-size.

Thanks in advance