The pricegrid price grid header gets recalculated under in several scenarios.
When the user opens the pricegrid price grid detail screen for the very first time.
when When the user is on at the pricegrid price grid detail page , and wants to recalculate the header information.
when When the user changes the values of the input fields on values in the pricegrid price grid header and then recalculates the header. This is similar scenario to the previous onescenario, but the flow is not so straightforward, so we cover it too.
