Popup close problem

Hello,
I'm currently developing a custom dateChooser component which can display multiple months at once. I created a popup window witch contains the months and created an event that fires when a date is selected. Now all this works, but when I try to close the popup I get an error.
Source:
private function dateSelected(event:DateChangedEvent):void {
trace(event.selectedDate); // The trace displays the date
PopUpManager.removePopUp(dpw);
The error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.managers::FocusManager/childHideHandler()[E:\dev\4.0.0\frameworks\projects\framework\s rc\mx\managers\FocusManager.as:1744]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\co re\UIComponent.as:12266]
at mx.core::UIComponent/setVisible()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\core\ UIComponent.as:3038]
at mx.core::UIComponent/set visible()[E:\dev\4.0.0\frameworks\projects\framework\src\mx\core\UIComponent.as:2997]
at mx.controls::CalendarLayout/mouseUpHandler()[E:\dev\4.0.0\frameworks\projects\framework\s rc\mx\controls\CalendarLayout.as:2497]
Any help is appreciated!

I just ran into this bug as well. Very frustrating...
I get this error message when I'm trying to close my popup using the 'X' button in the top-right corner. In my root tag (TitleWindow), I assign the following method to the close event property of the window:
private function onClose() : void
PopUpManager.removePopUp(this);
While the workaround helped the other user based on his use case, it doesn't apply to mine. Is there a workaround you can suggest for me?
Thanks,
-Jose

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