At CT502000 screen in Acumatica I noticed filterable pop up which filters data. How to add similar filter to my grid? Please don't confuse them with PXDialog pop ups.
I assume you need PXFilteredProcessing attribute. For example in my project I did the following:
[PXFilterable]
public PXSelectReadonly<AnticipatedPayrollDetail> AnticipatedPayrollDetails;
This code caused apperance of the following filter: