Ionic 2 nightly New Datetime Picker component Behavior

Hello ionic team,

I just upgrade my ionic 2 project to beta 0.8, to make use of new components like popover, datepicker.
Datepicker worked perfectly, only one problem i am facing is when datepicker is opened up when i m pressing hardware back button ( the page on top of navigation is closed down ) but datepicker remain still on the screen.

i will post some screenshot here ( i used emulator, pressing hardware back button )

how to solve it?