Attempt to fix blank lockscreen.

    }

    private void instantExpandNotificationsPanel() {

        // Make our window larger.

        mStatusBarWindowManager.setStatusBarExpanded(true);

        // Wait for window manager to pickup the change, so we know the maximum height of the panel

        // then.

        mNotificationPanel.getViewTreeObserver().addOnGlobalLayoutListener(

                new ViewTreeObserver.OnGlobalLayoutListener() {

            @Override

            public void onGlobalLayout() {

                if (mStatusBarWindow.getHeight() != getStatusBarHeight()) {

                    mNotificationPanel.getViewTreeObserver().removeOnGlobalLayoutListener(this);

                    mNotificationPanel.setExpandedFraction(1);

                }

            }

        });

    }