Gcode to update status line in full graphics LCD?

On every layer change, I'd like to change the status line on my RepRapDiscount Full Graphics LCD to a short arbitrary string.  I am sometimes using Simplify3D to drive the printer directly, which doesn't update the UI with any status so it sits there uselessly reading "Idle" the whole time.

Is there a Gcode command to update the status line manually, which I can embed into my gcode files?


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