Buy Sell Arrows in ADX Indicator

Can i add Buy Sell Arrows in existing Metastock Indicator


I shall be grateful if the members can explain to me if it possible and if so, how to add a buy or sell arrow in an existing Metastock Indicator like the Directional movement ADX.
I want that a sell arrow should come when ADX is above 50 and Buy arrow when ADX is below 10. Also how to change the values once this facility has been added


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