What did I do wrong?
I noticed that when I docmd.open form, the form opens but it is giving me to add a record.  I turned on record selectors and it shows me 1 of 1 the endrecord is Greyed out.  

Example is from previous command
Docmd.openform "CustomerF",,,"CustomerID=" & CustomerList

Even I change the customerlist to = 4

I did some test, maybe I am doing something wrong in the code.

I created a new button on a new blank form, I called it test.  The event for the open click button is

Docmd.openform "CustomerF",,,"CustomerID=4"

This is just to satisfy me and you.

The result is the same, the form open but it give me a blank for as if I will enter a new record.

Waaaah!

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Reply from Richard Rost:

Check the underlying table. Do you have a record with and ID of 4?