Qt in AI Panel on MAC: Keyboard events/focus issue

My plugin has panels that use Qt for UI, runs fine on windows. But on mac (qt embedded in panel using QMacNativeWidget) , QLineEdit and other components do not seem to receive focus, nor are processing keyboard events. I cannot type into the text boxes or navigate through tree widget.
From Qt forums, seems like it is a known issue. Has anybody faced this issue, found a solution for this?
Qt: 4.8.6
OS: Mac os maveric
Illustrator: CC

There is a crude workaround that seems to work for me.
I subclass QLineEdit and override QWidget::macEvent for detecting mouse events. On a button press I activate
the window and set the focus manually:
#include <Carbon/Carbon.h>
bool MyLineEdit::macEvent ( EventHandlerCallRef caller, EventRef event )
if(GetEventClass(event) == kEventClassMouse) {
 if(GetEventKind(event) == kEventMouseDown) {
 activateWindow();
 setFocus(Qt::OtherFocusReason);
return false;
I admit that this is not a perfect solution, but at least it gives you /some/ sort of usable behaviour.

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Qt in AI Panel on MAC: Keyboard events/focus issue

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