Problem with Java IDE?

Now I'm trying to create an application in Java using NetBeans. The problem is that when I try to hand code the GUI without the "drag-and-drop" facility, it becomes very very tedious and even then the GUI is far from perfect. Now if I use the "drag-and-drop" in NetBeans, then I can place the components exactly where I want them. However, on a few occasions I need to modify the automatically generated code but NetBeans won't allow me to do that! For example while using a combo-box, the items in the list are not static, but are generated dynamically by my application. I cannot do that! So can anyone please help me find a way to get over this problem.....Thanks in advance...