The functionality of hiding a FileDialog does not exist on Windows, but
does on Solaris;
For GUI-style reasons it may be justifiable to not allow a program to hide a
FileDialog after showing it (programmatically, without user interaction).

However, at the very least the behavior should be documented and consistent.

Here is a sample program to demonstrate the problem. This pops up a tiny Frame, and a FileDialog, then tries to hide the dialog; the hide() methods returns
'immediately' on both platforms, but on Solaris has the desired side-effect
of removing the dialog from the screen, and causing the show() method to return.
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import java.awt.*;

public class F extends Thread {

  public void run(){
    System.err.println("calling show");
    FD.show();
    System.err.println("show returned");
  }

  public static void main(String[] args){
    Frame f = new Frame("F");
    f.add("Center",new Label("XXX"));
    f.pack();
    f.show();
    FileDialog d = new FileDialog(f,"Pick a file");
    F x = new F();
    x.FD = d;
    x.start();
    try{Thread.sleep(5000);}catch(Exception e){}
    System.err.println("Calling hide");
    d.hide();
    System.err.println("hide returned");
  }

  FileDialog FD;
}