tkpanels: add missing AnimPanel imports

direct/src/tkpanels/AnimPanel.py

@@ -9,13 +9,16 @@ __all__ = ['AnimPanel', 'ActorControl']
 # Import Tkinter, Pmw, and the floater code from this directory tree.
 from direct.tkwidgets.AppShell import *
 from direct.showbase.TkGlobal import *
-import Pmw, sys
+import Pmw, sys, os
 from direct.task import Task
+from panda3d.core import Filename, getModelPath
 
 if sys.version_info >= (3, 0):
     from tkinter.simpledialog import askfloat
+    from tkinter.filedialog import askopenfilename
 else:
     from tkSimpleDialog import askfloat
+    from tkFileDialog import askopenfilename
 
 
 FRAMES = 0