1. Add a reference to the 'ACCPACXAPI 1.1 Type Library' To your project.
2. Create and open a xAPI session object.
Dim session As ACCPACXAPILib.xapiSession
Set session = CreateObject("ACCPAC.xapisession"

session.Open <UserName>, <Password>, <Database>, Date, 0
Username and Password are valid accpac usernames and passwords. Such as "ADMIN", "ADMIN". Database is your valid company ID. Such as "SAMLTD" for the ACCPAC sample company.
3. Decalare and open the view.
Dim GLACCOUNT As ACCPACXAPILib.xapiView
Set GLACCOUNT = session.OpenView("GL0001", "GL"
4. Use the view to fill the combo box.
Combo1.Clear
With GLACCOUNT
.Init
.Order = 0
.Browse "", True
Do While .Fetch
Combo1.AddItem .Fields("ACCTID"

.value
Loop
.Cancel
End With
5. Destroy the objects when not needed.
Set GLACCOUNT = Nothing.
That's it in a nutshell. If you have any errors or problems let us know. this was off the top of my head.
One thing, if you have a lot of accounts then your combo box might get pretty long. It might be better to use a finder like Accpac does.
Thanks and Good Luck!
zemp