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This is an odd one. Using a new installation of NB 3.4 Beta 3. I mounted a directory, and then did New -> Java GUI Forms -> JFrame and Form Editor came up and the generated sources were displayed in the Source Editor. However, the generated sources did not become the current tab in the Source Editor, the Welcome Screen continued to be the current tab. Creating a second form correctly fronted the sources for the second one. I repeated the same sequence but did an New -> Java Classes -> Class instead its its sources were correctly fronted. Therefore, I suspect this is a form editor problem.
If you switch the the GUI Editing first, it does not matter if you open form or java only -- welcome page is selected in the editor. This might be some winsys issue...
Because Window System v1 will not be supported from now by our team, all old winsys issues (now "core/window system v1" issues) are going to be closed as WONTFIX. Changes in API which emerged both from UI spec and problems with adjusting to the older API are described in the document http://core.netbeans.org/windowsystem/changes.html. It shows also recommends how the client code should be adjusted to the new window system. If you think this issue apply also to the new winsys then change the subcomponent (to "core/window system") and REOPEN it.
issue doesn't apply to new window system - verified