I don't have Sonar or the SD2 plug but I searched around for you anyway. This is what I came up with.
Clicking on the Program "triangle" brings up Program Management Options. You may be able to find some setting there about what to display.
If you are on a Windows computer, you can see the help file at this location...
C:/Program Files/Cakewalk/VstPlugins/Session Drummer 2/Documentation/SessionDrummer2.chm
I also found an article on SOS. It may reveal how the software decides what to display. Here is an excerpt from it...
"Not only can you add your own sounds, you can change the look of SD2 by creating your own skins. SD2 is actually a very easy program to 're-skin' (about the only one that's easier is the Combinator part of Reason), so it's a good way to learn about re-skinning in general.
Go C:/Program Files/Cakewalk/ VstPlugins/Session Drummer 2/Resources. There you'll see a bunch of .BMP files; these are the individual elements (background, buttons, pads, and so on) that make up SD2's graphic look. I strongly suggest making a copy of the resources folder and calling it 'Original Resources', or something similar. That way, you can modify the files in the Resources folder as much as you want, but always get the original back if needed.
Another precaution is that if you want to change a file, first change its file name to something like 'Background_orig.bmp', so you can always return to it by simply deleting '_orig'. Then open that file in a graphics program, do your thing and save under the original name (otherwise, SD2 won't recognise the file). Next time you open up Sonar and Session Drummer 2, it will reflect any changes you've made."
