bool trendUp = true;   // defined in strategy

if (!trendUp && Low[0] > AvgPivotHi[0] && Low[1] > AvgPivotHi[0])            // the trend just changed to up (GREEN)
{
   trendUp = true;
   GO_LONG_OR_WHATEVER_ELSE_YOU_WANT_TO_DO
}
else if (trendUp && High[0] < AvgPivotLo[0] && High[1] < AvgPivotLo[0])    // the trend just changed to down (RED)
{
   trendUp = false;
   GO_SHORT_OR_WHATEVER_ELSE_YOU_WANT_TO_DO
}

// You may also want to use the code below as well...only works if you have the above code.

if (trendUp)   // trend is up
{
    DO_SOMETHING
}
else // trend is down
{
    DO_SOMETHING
}