I can specify evaluation time of a summary Variable for a Group, to derive the desired contents for printing.
When I want to condition print characteristics of an element based on the value of this Variable, to obtain a valid result sometimes I must evaluate the Variable at some time other than "Now", e.g., at "Group".
Please add either an independent "Evaluation Time" for "Print When Expression" with the same values as apply to the Text Field Expression, with an additional value of "Match Evaluation Time for Text Field Expression".
Having this new attribute as potentially independent from the Text Field Expression Evaluation Time means that I can condition many elements (including statics) in a group header based on the end-of-group value of a group summary variable.
It will also be much easier to implement than using the Text Field Markup property.
It will be possible to condition the printing of statics based on an Evaluation Time of other than "Now".
Consider adding this property to Styles, as well, as I think this would be useful there.