I still urge you to consider my comments above, but you should be able to cause BBM to come to the foreground with:
int modHandle = CodeModuleManager.getModuleHandle( <bbm module name> );
ApplicationDescriptor[] apDes = CodeModuleManager.getApplicationDescriptors( modHandle );
ApplicationManager.getApplicationManager().runApplication(apDes [ 0 ] );
You will have to find out what the appropriate module name is and put that string in the call to getModuleHandle(). BBM has a bunch of modules and I don't know off hand which one is the main one.