s:TextArea loses it's copy/cut/paste context menu entries when it's placed inside a s:TitleWindow, and no way to assign a customize context menu to it

Steps to reproduce:
1. Create a component based on s:TitleWindow and place a s:TextArea in it.
2. Use PopUpManager in the main program to pop up the component created in 1
3. Bring up the context menu inside the TextArea
4. Execute some code to customize the context menu for the TextArea

Actual Results:
3. Copy/cut/paste are not there
4. The context menu is not changed

Expected Results:
3. Copy/cut/paste are expected to be there
4. The context menu should change to the customized one

Workaround (if any):
Use mx:TitleWindow instead of s:TitleWindow