Hi Marko,
The examples that ship with labview are awesome, and there is a great one that shows how to configure and change programmatically some characteristics of the tab control pages: this includes colour, size etc.
The example is found by, help>>find examples>>building user interfaces>>controlling front panel objects programmatically>>Tab Control Properties.vi
Then for your situation, I suppose you'd change in the bottom left case structure, with "first page" and "second page" by having only one 'dial' but two indicators...this sounds similar to your suggestion. And the dial would be your data.. The 'tank' would be your graph.
Let me know how you get on.
Thanks,
Kind Regards
James Hillman
Applications Engineer 2008 to 2009 National Instruments UK & Ireland
Loughborough University UK - 2006 to 2011
Remember Kudos those who help! 😉