Sonitus compressor in X2 Essentil will not sidechain...

I have some problems with sidechaing using Sonitusfx compressor in Sonar X2 Essential.
So after I load the Sonitus compressor (vst) in the effect bin of one of my tracks and I want to send another track to its sidechaing input, this input it will not show up in my tracks sends options.  The compressor is working fine on the track on which was loaded but it only does it like a regular compressor. Its sidechaing inputs will not be displayed in other tracks sends option... Same problem with Sonitus gate (I just purchased the whole Sonitus suite). 
Does anybody know how I could make it work? 
My X2 is installed as 64 bit (on Win7), but this souldn't matter because other 32 bit effects are working fine...
Thanks !

I can't see it in the list. I only have my sound card, and some busses (in this case) and definitely no sidechain input for the compressor. I tried to turn off the 64 bit double precision engine but still not showing up in the list . Somehow Sonar doesn't recognise the Sonitus compressor to be a sidechainable compressor...

I believe that may be a misprint, Steve. X1E(and SHS6) had a limit of 5 sends per track.
I can't imagine a 5 send per project limitation being imposed in X2E.
As for side inputs being messy, they are pretty clear in X1E, as seen below.
This may be an issue specific to X2E. I'm on an XP platform, so have not upgraded to X2.
Sorry, Chris. I can verify that it works in earlier versions, but I can't check X2.

I sent an email to tech support but no answer yet...
 
What I found out in the meantime is that for a sidechainable VST plug-in to show one sidechain input, the maximum used inputs from "VST plug-in properties" must be set to 4. If set to 2 the plug-in will not show any sidechain input, even if its capable of sidechaining...
(thats: utilities>cakewalk plug-in manager>"select your vst">plug-in properties> set max used inputs)
By default  the "maximum used inputs" for my  Sonitus Fx vst's ( for all compressor, gate etc..) is 2, and it cannot be changed ! If I set it to any other number it will not be saved...
 
This means now that I'm still doing something wrong, there is a bug with my X2a or my SonitusFx compressor and gate are not sidechain capable... So what could be?
 

Problem partially solved... :
I downloaded some free sidechain compressors I found online (Molot on 64bit and    from Reaper ) and  I was able to find their sidechain inputs in the send's list. Also they display 4 max inputs, and they work fine...for free !
 
This means that Sonar X2 Essential has a problem with recognising Sonitus compressor and gate as sidechainable (if they are indeed sidechainable as they say...) in both 32 bit and 64 bit versions.
I'm not sure if this is a bug or some advanced settings related thing (coding?) but I reported it to Cakewalk, just in case...
 
Thanks again for help!