
how to create a new widget that floating on the top of all widgets, I used stack to achieve this function, but when I used showGeneralDialog to open a pop-window, this widget is below dialog, how to let it above dialog like that demo?

how to create a new widget that floating on the top of all widgets, I used stack to achieve this function, but when I used showGeneralDialog to open a pop-window, this widget is below dialog, how to let it above dialog like that demo?