I actually have a function and process for this. I use a BMPGET to display the get field with a small bitmap calendar at the end. Clicking on it brings up a calendar dialog. I've had it so long I don't remember if it was part of FWH or where it came from.
If you want to email me directly I'll package the code and the bmp and send it to you, but you might experiment first with a BMPGET that calls the datepicker class.
tCalenda is part of the current FWH and I use it in a dialog. It is now working fine.
I'd still love to see coding for an appointment grid like is available in Outlook. I know several people have been working on one.