Green light apprears on the tabs, when there is exactly same field list box or multibox present in a tab and selections has been done. May be date period field is different in all the tabs or you do not have that particular object in some of the tabs.
However if you want to see, tabs are updated( green light on tab ) with current selections or not, then you can place same list box or multibox in that tab and hide those with layout condion. something like 1=0.
Hope it helps you.