code: def OnDoubleClick(self):
      if self.flist:
          frame, lineno = self.info
          filename = frame.f_code.co_filename
          if os.path.isfile(filename):
              self.flist.gotofileline(filename, lineno)
  
imports: import linecache
  import os
  import tkinter
  from idlelib.debugobj import ObjectTreeItem, make_objecttreeitem
  from idlelib.tree import TreeNode, TreeItem, ScrolledCanvas
label_desc: Use image node_id 4 for calling the FrameTreeItem obj's underlying member method code with example usage: obj.OnDoubleClick() without return types