Refresh Dlookup data in the active row of a datasheet after modifying data

Difficult to explain - so I will give you my scenario -I have three tables Student, Home Room and Teacher - the Student is linked to a home room and the home room is linked to the Teacher. In my form using Student, I show the student, the home room and the
Teacher for that home room. (The student file has the HomeRoomID in it). I show the teacher by looking up the teacherID using the HomeRoomID (using Dlookup on the HomeRoom table to get the teacherID), save it to a textbox IDTeach. Using another Dlookup on
the Teacher table using IDTeach I get the teachers name in a textbox call TeacherLast
Works fine! - however if the home room is changed, using a combobox, the teachers name does not change -it does change if the data is refreshed (The HomeRoomID in the Student Table is of course changed)
My goal is to have the teacher name change in the row where the when the homeroom is changed.
I went to the Event - after Update on the combo box and tried to update the teacher ID and teacher name by using
Private Sub HomeRoom_AfterUpdate()
Form![IDTeach] = DLookup("[TeacherID]", "Home Rooms", "[HomeRoomID]=Form![HomeRoomID]")
Form![TeacherLast] = DLookup("[Last]", "Teacher", "[TeacherID] = Form![IDTeach]")
End Sub
But this doesn't work (Run time error 2448) because, I believe, it is trying to update all the rows in the datasheet.
Is there some way to qualify these statement to only work on the current row like
Form.currentrow.IDTeach = DLookup("[TeacherID]", "Home Rooms", "[HomeRoomID]=Form.currentrow[HomeRoomID]")
or is there and easier way (or anyway for that matter)?
Thanks

There is a 1 to 1 relation between the student and the teacher - a 1 to 1 relation between the student and the home room, but a 1 to many relation between the teacher and the room.
Surely not? It would be a very exclusive educational establishment where every student had their own personal teacher, and their own personal room. A one-to-one relationship type between Teachers and Rooms is understandable, but is not the relationship
type between Rooms and Students one-to-many? The relationship type between Teachers and Students would also be one-to-many of course, but no enforced relationship needs to be created for this as it is implicit in an enforced relationship between Rooms
and Students. Diagrammatically the model would be:
Teachers----Rooms----<Students
A form simply needs to be based on a query which joins the three tables in this way with editable controls bound to the columns from Students and a read-only control bound to the Teacher column from Teachers. The control bound to the foreign key Room
column in Students would be a combo box. Once a room is selected the Teacher for that room would automatically show in the read-only text box bound to the Teacher column.
To make a control read-only BTW set its Locked property to True and its Enabled property to False.
Ken Sheridan, Stafford, England

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hi
i want to know,,can u say ur need clearly...and i attached two image u see that one
Indrajit
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Attachments:
station.JPG ‏35 KB
station2.JPG ‏79 KB

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