Sorted:

Why is there no response when clicking on the menu displayed by TrackPopupMenu?

The issue with displaying line breaks in strings in Ext.MessageBox.alert() in ExtJs.

Create a software similar to 360 Software Manager using C#.

The issue with Dialog.dismiss

How to use the domainUpDown

The Linux system consistently reports Hardware Error in both the terminal interface and logs.

Regarding the issue of RelativeDate

The purpose of the javax.persistence package

Usage of setPositiveButton() and setNegativeButton()

What should I do if a buffer overrun is always detected when starting up my computer?