[macosx] Press "To Back" button on the Dialog,the Dialog moves behind the Frame

Testsuite name:AWT function
Test name(s):AWT_TopLevels/TopLevelMiscellaneous/Manual/WindowToBackTests_05
Product(s) tested:JDK8u102b32(64bit)
OS/architecture: mac10.10-x64, mac10.11-x64

Reproducible: Always
Reproducible on machine:Evergreen-machine
[If Sometimes] Also reproducible on machine:

Is it a Regression: YES (test passes on 8u102b08 and 8u102b31)
[If Regression] Regression introduced in release/build: 8u102b32
Test result on the last GAed release for this train: 8u102b31
[if Fail] Test result on FCS: PASS

Is it a platform specific issue: YES
[If platform specific issue] Is it a new (previously unsupported) OS/browser/mode testing: not new
[If new configuration testing] Issue specific to execution mode or OS/browser version: OS X 10.10, 10.11 (test PASSES on Win8.1)

Steps to reproduce:
1.Install stable jdk8u51b15(64bit) locate at /Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk
2.Install base jdk8u102b31(64bit) locate at /Library/Java/JavaVirtualMachines/jdk1.8.0_102_b31.jdk
3.Install test jdk8u102b32(64bit) locate at /Library/Java/JavaVirtualMachines/jdk1.8.0_102_b32.jdk
4.Install awt worksoace locate at /var/root/Desktop/awt/ws
5.Install ute local at /var/root/Desktop/awt
6.Add attachment testlist.fail to /var/root/Desktop/awt
7.Create results at /var/root/Desktop/awt
8.Modify the test_awt.sh as:
/var/root/Desktop/awt/ute/ute run -harness tonga -env TONGA_MAIN_CLASS=Tonga -env KEYWORDS=manual -env BASEBUILD="/Library/Java/JavaVirtualMachines/jdk1.8.0_102_b31.jdk/Contents/Home" -env STABLE_JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk/Contents/Home" -component awt -jdk "/Library/Java/JavaVirtualMachines/jdk1.8.0_102_b32.jdk/Contents/Home" -testbase /var/root/Desktop/awt/ws/awt/ -testlist /var/root/Desktop/awt/testlist.fail -results /var/root/Desktop/awt/results
9. Go to /var/root/awt and run the command : bash test_awt.sh
 
Case Instruction:
Note : Incase of Assertion failure user can enter any remarks by pressing 'Assertion Fail Remarks'.
1. After the Frame and Dialog are displayed
2. Press To Back button on Dialog.
3. If Dialog moves behind the frame then fail the test.else click assertion passed

Actual behavior:
Press "To Back" button on the Dialog,the Dialog moves behind the Frame,refer to back.jpg.