Hello Nadya:
>>
>In the above code I don't see any reference to page4, only page5.
>
My apologies. The problems arises only when I click on page5 not page4. However, all of the data is gathered when a patient is selected from the combobox (InterActiveChange)

>I will try to look closely, but for now try to comment out this whole block of code and see, if the error still appears...

I commented out the code. Result: The gird was not built and I did not get the error message. This was accomplished with the new cmdReturn button with the coded "thisform.release()" in teh click event.

Interestingly, the original cmdReturn which is part of my baseform did not want to work. i.e., I could click on it and nothing happens, but allows me to nagivate thru the pages in the pageframe. I can't understand why.

Again, thank you for taking the time to discuss this with me.