qt - Unable to click on QWidget with Qt:WindowStaysOnTopHint flag attribute - Mac only issue

Question

I have a class

class LocationLineEdit:public QLineEdit{
private:
QWidget* mpListPop;
MySuggestionList* mpLocationListView;
}

on a modal dialog, which includes a popup list:

class MySuggestionList:public MyAutoScrollArea {}
class MyAutoScrollArea:public QScrollArea {}

initialized as:

mpListPop=new QWidget(pParent, Qt:Tool | Qt:WindowStaysOnTopHint | Qt:FramelessWindowHint);
mpLocationListView = new MySuggestionList(mpListPop);

pParent = parent dialog box (even for lineEdit)

This issue is only on Mac. The issue here is: I am unable to click on mpListPop (as soon as mpListPop is populated and shown) though the navigation keys (left and right) are working fine. I can't go away with Qt::Tool. If I don't use Qt:WindowStaysOnTopHint, then mpListPop is shown behind parent widget (bug in Qt4.7 and fixed in Qt5.0. I am using Qt4.7) and using Qt:WindowStaysOnTopHint is a necessity for me. On Widows, this implementation (even without Qt:WindowStaysOnTopHint flag) is working perfectly fine.

Any suggestions are welcome. Thanks in Advance.

~Andro