Barometer in Skinned Tray tooltip?

Why can’t the Barometer in the Skinned Tray tooltip say if its Steady,Rising or Falling?

Your competitor Weather Pulse can do it. They call it Pressure but its the same thing.

In Weather Watcher Live, the following is displayed:

  • = rising
  • = falling
    (nothing) = steady

The “+” and “-” appear to the right of the barometer value (e.g. 29.78+ inches).