Randy: I have not been able to repro the problem. Here are the steps I used, please check them to see if I should be doing something different to make the problem happen:
1. Create new VB.NET Windows Application
2. On Form1, add a tab control. Add one page to the Tab control
3. Add two textboxes and a checkbox to the page (the texboxes are to grab focus when you press Tab)
4. F5
5. Set the focus to the checkbox
6. Wait 10 minutes
7. Press Enter. Nothing happens (as expected)
8. Press Tab. RESULT: The focus moves to the textbox as expected


Questions for you:
Is anything interfering with the program while it is running:
1. Is there a screensaver running?
2. Is the program running from a local drive or network drive?
3. Is your application multi-threaded?
4. Are there any other forms open that might be locking the app?
5. Is it possible that another event has been fired - What events are the form/controls trapping?


Looking forward to helping you find a solution
Yag


>Hello YAG, here are a few more results.
>The problem occurs when the machine or the application sets idle for at least 5 minutes. The problem only occurs for checkboxes that are added to a tabpage. Other checkboxes that I use in my application that are placed directly on a form work fine.
>
>The problem can be reproduced with the virus protection disabled.
>
>The problem is not project specific, I added a checkbox to a tabpage on another VB.NET app (no code for the checkbox) and the problem was reproduced.
>
>I also have a delay in accessing the menu after the app sets idle.
>
>I hope this helps.