public void setContentShown(boolean shown) {
        setContentShown(shown, true);
    }
Control whether the content is being displayed.  You can make it not
displayed if you are waiting for the initial data to show in it.  During
this time an indeterminant progress indicator will be shown instead.

@param shown If true, the content view is shown; if false, the progress
             indicator. The initial value is true.
@see #setContentShownNoAnimation(boolean)
progressfragment-native/src/com/devspark/progressfragment/ProgressFragment.java