Thread.start doesn't work?

[Plumm]

Hi:

  I just tried a DWT problem with a heavy file processing bound to a button.That's why I chose to use Thread, or the background thread/GUI thread would be locked and no refresh.

  The problem is the thread seems do nothing. And even the isRunning returns false right after calling start.

  The environment is dwt-win 3.4.1 with tango 0.99.7 / DMD 1.033 which is right the version downloaded from the DWT download page.

  Thanks for any answer.