I've been building an application using straight Tkinter and Pmw
megawidgets. Recently, I needed a collapsible tree widget, which Pmw
didn't have; so I turned to Tix. Now, here's the problem. My
application uses a Pmw.PanedWidget to separate the window into panes;
the tree needs to be packed into one of the panes. Everything works
fine until I try to activate the "expand/collapse" ability, by using
tree.setmode() or tree.autosetmode(); when I try to do that, I get the
following error:

X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 12 (X_ConfigureWindow)
Serial number of failed request: 457
Current serial number in output stream: 459

If I DON'T use the setmode() functions, the program works fine, but
the tree can't be collapsed/expanded (which is why I wanted it in the
first place).

Also, the error doesn't occur if I pack the tree into a regular
Tkinter.Frame; it only happens when I try to pack it into the Pmw
panes. However, each Pmw pane **IS** a Tkinter.Frame, so I can't
figure out what's wrong!!!

Can anyone help me please?