GtkProgressBar state update issue

[Timofei Istomin <tim ist gmail com>]

Hello,
I'm developing an embedded application using GTK+ (2.16.6) on the DirectFB
backend.

I use the gtk_progress_bar_set_fraction() to set the progress value, but it
doesn't affect the visible state of the widget until the touchscreen is
tapped.

Other GUI elements (buttons and text entries) are all working, so I presume
that the glib main loop is OK.
The gtk_progress_bar_set_fraction() is called by a separate thread.

I suspect it can be a windowing issue, I don't use any window manager, the
application consists of several fullscreen windows that are switched by
gtk_widget_hide() and _show() functions. Is it correct?

Thanks.
Timofei Istomin.