Welcome to JavaRanch.
But our problem is when we select the fiels in child window, the condition is: cannot select not more than 2 field in the child window.
What do you mean by "select a field" - a field is something you enter text in, not something to be selected. What exactly is it you're trying to "select"? Can you post a
minimal example of code that shows the problem?
For future reference:
UseAMeaningfulSubjectLine