The Ivory II grand pianos—especially the Steinway—sound phenomenal.  They are not, however, very wide even when stereo imaging is at 100%.
 
Is there a simple way to widen the stereo image?  This VI does not sound as wide to me as the acoustic pianos I have recorded with two mics, although otherwise the sound is perfect.

Nomad Factory Blue Tubes has a stereo imager which works reasonably well in moderation.

Waves S1 is a good one too. I usually use it the other way where too wide stereo is better at 1100-1400 hours or so.
http://www.waves.com/plugins/s1-stereo-imager
 
S1 is part of Gold bundle, and look for a campaign if you can wait, but not right now it seems.
From time to time as single as well.
Power pack is a good deal right now - $129 for 10 plugins, and looking at Audiodeluxe or WavesUniverse even cheaper.

FLUX stereo-toolv3 free vst

Sonar x3 comes with the Nomad Factory Blue Tube Bundle, which includes a stereo widener.  Which version of Sonar are you currently using?
 
Voxengo has a free stereo widening plugin you can download and use for free.
 
See the link,  http://www.voxengo.com/product/stereotouch/
 
Peace,
 
Jesse G
 

Or Channel Tools does a decent job too.

Channel Tools works, but I've got to put it out there that the only times I've had issues with Sonar Plat is when i've used/inserted Channel Tools into the project. Some others have reported quirks with it also. It may be fine, just saying.
 

Great ideas, guys.  Some of these plugs sound like things I will use more than just for this.  (Craig, You know I am sometimes prone to a rather wide image. )
 
I will have to look at Channel Tools again, though, because I found it to be useful only for narrowing or reversing L/R. I did not think it could widen.

It has a widening preset.

OK, cool.  I see the widening preset—thanks.  In the case of Ivory, though, I am still getting more left meter across the whole keyboard.