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Seemingly Simple Bindings Question

I have an NSPopUpButton with five menu items: WTD, MTD, QTD, YTD, and Specific Dates. What I want to do is show and hide two labels and textfields for Start Date and End Date depending on if the Specific Dates option is selected.

My first attempt was to do

@property (readonly) BOOL specifyingDateRange;

-(BOOL)specifyingDateRange{
    if([dateRangePopUp indexOfSelectedItem] == 4){
        return YES;
    }
    return NO;
}

but this is not working correctly.

Can anyone explain what the correct implementation is and possibly what mistake I made in assessing the problem?

Thanks in advance,
Jamie
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