private VirtualFile[] getVirtualFileArray() {
   ArrayList<VirtualFile> result = new ArrayList<VirtualFile>();
   TreePath[] selectionPaths = myTree.getSelectionPaths();
   if (selectionPaths != null) {
     for (TreePath selectionPath : selectionPaths) {
       AbstractTreeNode treeNode = (AbstractTreeNode) selectionPath.getLastPathComponent();
       result.addAll(treeNode.getVirtualFiles());
     }
   }
   return VfsUtil.toVirtualFileArray(result);
 }