How to expand rows in a table by calculated value of a field

Hi,
I'm trying to set the rows of an expandable table to follow the calculated value of a field.
The calculated field comes from two date fields that calculate the number of days and I want my table/row to expand based on that number..
Is is possible? Right now I have a button that does add an instance "Admin_Use.Table3._Row1.addInstance(1);" but I want it to be triggered by the calculated field instead...
Thank you so much!!!!

Hi Niall,
Thank you for your reply. I'm still a bit puzzled as right now I have this code in my calculate field (see below) under the calculated event and I'm not sure how to insert the code you sent me as I keep getting syntax errors. Any help will be greatly appreciated!!!
if (HasValue(Nights.FirstNight) & HasValue(Nights.LastNight) ) then
    if (Date2Num(Nights.LastNight, "YYYY-MM-DD", "en_IE") >= Date2Num(Nights.FirstNight, "YYYY-MM-DD", "en_IE")) then
        $ = Date2Num(Nights.LastNight, "YYYY-MM-DD", "en_IE") - Date2Num(Nights.FirstNight, "YYYY-MM-DD", "en_IE") + 1
else
        xfa.host.messageBox ("The first night cannot be after the last night", "Nights Covered", 0)
        Nights.LastNight.rawValue = null
endif
else
endif

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