Cannot set class function break point in Octave 4.0.0

[Heng Sun]

I had hard time to set a break point for a class function. I am using Octave 4.0.0 on Window 7.

In my work dir, I have a folder named "@DebugTest". It has two m files:

File DebugTest.m has contents (2 lines):

classdef DebugTest

endclassdef

File d.m has contents (3 lines):

function d(dt)

  disp('Break here please.');

endfunction

I run the following three lines in command window (Octave GUI):

dt = DebugTest();

dt.d();

dbstop("@DebugTest/d");

Here is the output screen shot:

>> dt = DebugTest();

>> dt.d();

Break here please.

>> dbstop("@DebugTest/d");

error: add_breakpoint: unable to find the requested function

>>

We see desired output. So my class function is recognized without any problem. But the error message shows I cannot set a break point. Remark that I cannot set break point on the GUI  by mouse click.

What do I need to do to set a break point for a class function?

Thank you for help.

Heng