code: def OnDoubleClick(self):
      if not os.path.exists(self.file):
          return
      edit = file_open(self.file)
      edit.gotoline(self.cl.methods[self.name])
  
imports: import os
  import sys
  import pyclbr
  from idlelib import PyShell
  from idlelib.WindowList import ListedToplevel
  from idlelib.TreeWidget import TreeNode, TreeItem, ScrolledCanvas
  from idlelib.configHandler import idleConf
label_desc: Use image node_id 5 for calling the MethodBrowserTreeItem obj's underlying member method code with example usage: obj.OnDoubleClick() without return types