To see the problem, consider following the following steps:
1. Click “Default Values” button
2. Click on “Create Car” button.
3. Click on “Drive” button.
4. Enter 210 miles. Click ok.
5. After 210 miles gas level drops down to 3 miles.
6. There is a raise event to inform the user to pump gas (if less or 5 gal.)
The problem is that the warning comes up two times.
Question: How can I correct it so that the low gas warning will come up only once?