I got an A11Y bug which was forked from projectui/src/org/netbeans/modules/project/ui/BrowseFolders.java, the A11Y
toolkit shows the following error when opening the Browser dialog:

     Components with no LABEL_FOR pointing to it :
       Class: org.openide.explorer.view.TreeView$ExplorerTree {  |  } 

Then I found that there are so many such Browse dialogs have the same issue and they are either forked from the above
Java file or just use org.netbeans.spi.project.ui.templates.support.Templates.createSimpleTargetChooser(). The Browse
dialog all have this A11Y issue.

In my forked coded, I use the following to resolve it that I'm not sure is correct! I think the BeanTreeView should have
someway to return the tree that is not currently available:
    BeanTreeView btv = new BeanTreeView();
    ...
    someLabel.setLabelFor(btv.getViewport().getView());

Since there are at least 20-30 usages of this Browse dialogs in the current NetBeans IDE, mostly call
createSimpleTargetChooser(), I suggest it's a P2 bug that should be easy to fix and will fix lots of them.