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dhxWindows modal while processing

Here's what I'm trying to do.
I want to display a modal window while doing a long process in javascript then close the window.

But the window doesn't come up. It comes up if I put let say an alert to "stop" the process.
But if I let it run the window is never displayed.

var id = "message_window";
var win = dhxWins.createWindow(id, 50, 50, 200, 200);
dhxWins.window(id).setModal(true);
dhxWins.window(id).button("minmax2").hide();
dhxWins.window(id).button("minmax1").hide();
dhxWins.window(id).button("close").hide();
dhxWins.window(id).button("park").hide();
dhxWins.window(id).progressOn();
dhxWins.window(id).center();
dhxWins.window(id).setText("");
dhxWins.window(id).attachHTMLString("<h5>" + message + "</h5>");
dhxWins.window(id).show();

//do some long javascript processing

dhxWins.window(id).close();

Any idea on how to force the window to display or to wait for the window to be shown before continuing the process?

Thank you.

Try attached sample.