AVAppGetToolByName not working

Hi,

I'm developing an Acrobat 11 plugin using the Acrobat 11 SDK. I need to use the pencil/Ink tool in the plugin.

I'm using the below code to do it.

AVTool tool = AVAppGetToolByName (ASAtomFromString("Ink"));

AVAppSetActiveTool (tool, true);

But the tool is not getting set. On inspection, I found out that AVAppGetToolByName is returning null.

But there are certain documents on which it is working perfectly.

This is one of the documents on which its not working, http://www.newfangled.com/stuff/contentmgr/files/2/4948464a80b6d281a26 8afd22ca1ac73/chapter/pdftest.pdf

Please help me find out whats going wrong.

Thanks,