Updating a subform from a parent form

Subforms only reload data when they know they need to. Unfortunately they are not very smart. This recipe will show you how to force a subform to refresh itself.

How to do it...

1. Create a new form from Object Designer.

2. Add the following global variables:

   Name	Type
   A	Integer
   B	Integer

3. Add a global function named SetValues.

4. Add the following parameters to the function:

   Name	Type
   Aparam	Integer
   Bparam	Integer

5. Add the following code to the function:

   A := Aparam;
   B := Bparam;
   

6. Add a global function called UpdateSelf.

7. Add the following code to the function:

   CurrForm.UPDATE;
   

8. Set the following properties on the form:

   Property	Value
   Width	5720
   Height	1430

9. Your form should look like the following screenshot:

   

10. Save and close the form (for later use, remember the ID it is saved under).

11. Create a new form using the Object Designer.

12. Add the following global variables:

    Name	Type
    A	Integer
    B	Integer

13. Add two textboxes with labels for each variable.

14. In...