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  export SUGAR_LOGGER_LEVEL=debug
 
  export SUGAR_LOGGER_LEVEL=debug
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==== How do I use the Gtk+ Inspector? ====
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For Gtk+ 3.0 activities, an interactive inspector is available.
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Set the GTK_DEBUG environment variable to ''interactive'' before running an activity, like this;
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cd Activities/HelloWorld.activity
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GTK_DEBUG=interactive sugar-activity .
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Because Sugar Gtk+ activities are full screen, use Alt+Tab or Alt+Shift+Tab to switch between the inspector and the activity.
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See also https://wiki.gnome.org/Projects/GTK+/Inspector