connecting the add assignment panel correctly without add function

Still working on the rest of the function. Since Zach wants my code, so I push at so far I have done. Rest of the code will only be dealing with EditClassWindow, removeAssignment and AddAssignment.

1. when click on add, user will know which course and what category they are editing
2. All add assignments panels are connecting correctly.

There are some changes for form files. If you are not using netbean, you can ignore that.