TZF - TTzVFile anomaly

If anyone can shed some light on this anomaly, I'd appreciate it.  
 
Please check out the attached code.  I have come across an anomaly with the TTzVFile component which is causing me heartburn.  Maybe it's my code so I'm hoping you can give me some direction.  
 
In this example, I have a grid, a datasource, a TTzVFile, and three buttons on a form.  Event handlers have been coded for the AfterCancel, AfterEdit, AfterPost, and AfterScroll events of the TTzVFile component. 
 
In the AfterScroll event, which fires when the record pointer moves, the Enabled property of the Delete and Mortgagee buttons are changed.  Sometimes this isn't happening.
 
To see what I am experiencing, try the following:
 
Compile/Run the program
Click Add
Enter 1 in the Location field
Click Post
Click Add
Enter 2 in the Location field
Click Post
Click Add
Enter 3 in the Location field
Click Post
Click Delete
Click Yes
Click Delete
Click Yes
Click Delete
Click Yes
 
The Delete and the Mortgagee buttons are updated correctly (enabled := false).
 
Now try this:
 
Compile/Run the program
Click Add
Enter 1 in the Location field
Click Post
Click Add
Enter 2 in the Location field
Click Post
Click Add
Enter 3 in the Location field
Click Post
Select the first record in the grid by either scrolling to it or clicking on it.
Click Delete
Click Yes
Click Delete
Click Yes
Click Delete
Click Yes
 
The Delete and the Mortgagee buttons did not get updated.  They should be disabled.
 
Any suggestions?
 
Your help will be appreciated.
 
Randall H. Carpenter

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