My combobox is not reverting back to original value when the Cancel button (mmButtonCancel) is pressed.

The goal is to change the Status field in the Proposal table of my App.
There is a Status table with a list of Standard Status Codes and the Proposal table.

The mmComboBox on my form has the following properties set:

BindingFlag =True
BindingSource =Status
BindingSourceDisplayMember =Status.Status_desc
BindingSourceValueMember =Status.Status_id
BindingValueSource =Proposal
BindingValueSourceMember =Proposal.Status_id

DropDownStyle =DropDownList

The dropdown works and gets the list of Standard Status Codes from my lookup table. I can even save, reload the record and see my changes reflected.

However if I change a value and then click the Cancel Button, nothing happens.
I can change a value in a textbox and it will revert when cancel is clicked.

What am I missing?