2 Popus can not be active at the same time.
There's a workaround, and here's my old example: http://jsfiddle.net/Gajotres/8Arrt/
$(document).on('pagebeforeshow','#index',function(e,data){
$('#test-button').on('click', function(e) {
$('#MyFirstPopup').popup('open', {x : 100, y : 500, positionTo : 'origin'});
});
$('#popup-button').on('click', function(e) {
setTimeout(function(){$('#MySecondPopup').popup('open', {x : 100, y : 100, positionTo : 'origin'});},100)
$('#MyFirstPopup').popup('close');
});
});
Basically if you want to open second popup you must close the first one. That's why we need setTimeout to opet second popup after the first one has been closed.