(edited re-submission)
RE: Moving average cross indicator arrow alerts.

Please see image below for a visual of what I am hoping to accomplish. The indicator "2MA CrossoverWithPrice.mq4" shown below is the indicator in question. Is it possible to code the indicator so that it only shows the most recent arrow? In other words; as each new arrow is formed, the previous arrow disappears. There will therefore only be one arrow on the whole chart.
The SAR indicator below accomplishes a similar thing as an example. You'll see that the SAR indicator only shows the current dot when the indicator is attached to a chart.
I hope my request makes sense. Is it even possible to do? All help would be greatly appreciated.