Add record on one form immediately show on another form when closed

Hi all,
I have an issue that I cannot seem to find the answer to.
I have a DBCombobox using an ADO query as it's list source.
If the record (we'll say Vendor) is not in that list, the user double clicks
on that list where a modal form appears and he/she enters the new vendor.
However, after adding the new record, it is not available in the ComboBox
until I exit the program and open it back up.
Below is how I am trying to accomplish this.
Can anyone direct me as to how to accomplish this need?

var IntVendorID : integer;

begin
intVendorID := VendorID.EditValue;
frmJobLogEntry.VendorID.EditValue := intVendorID;
end;


.