Hide Tab Form Problem

Good day all.  I have a Class Structure called TO in my Document ItemType, Aras 11 SP10.  This classification has an assigned form for it.  I modified the labs_HideTabs method to hide the tabs.  I need to hide the Files tab if the TO classification is not Current.  I have been able to make this work by adding an if statement at the start of the hideTabs function checking for is_current = 0.  I was able to make this work when the Method is attached to the default Document form, but it will not work when attached to the Document_TO form associated with the TO classification.  It doesn't work even without the if statement.

Both Document and Document_TO forms are set to Default.

Any help would be appreciated.  Thank you.