Don't know how to edit this post, it posted prematurely, and the code is exact, but not formatted as desired.
I double-checked my markup several times, using the demo as a model. The edit template contains a combobox displaying Employee Name with a data value of EmpID. The custom filter is set up to filter on EmpID, but gets hung up will selection is made from filter drop-down, except when ALL is selected.
How can I get filtering to work?