windows phone 7 - Panorama Control not showing data -

i making panorama windows phone 8 app. first time have used 1 in app.

i having problems showing data in runtime. instead seeing list:

runtimeone runtimetwo runtimethree etc..

i don't have clue has happened, worked other day. going sampledata folder , changing lineone, linetwo, linethree, etc it's not doing when deploy app windows phone emulator.

what's happening there 2 different sets of data, , datacontext @ runtime different design time.

1. the data see in design mode ('design one', 'design two') stored in mainviewmodelsampledata.cs, changing doesn't affect runtime experience.

2. the data @ runtime coming loaddata method in mainviewmodel.cs

at top of mainpage.xaml, you'll see

      d:datacontext="{d:designdata sampledata/mainviewmodelsampledata.xaml}" 

and "d" namespace here mnemonic 'design'. if @ sample data xaml file, you'll notice declares class called mainviewmodel collection of items.

at runtime, mainviewmodel.cs (specifically loaddata method) adds items 1 one items property of mainviewmodel class, , class in turn set runtime datacontext in constructor of mainpage

the panorama control has markup like

            <phone:longlistselector margin="0,0,-22,0" itemssource="{binding items}"> 

so it's expecting see collection called items on whatever current datacontext is, , fact 2 different data contexts in play explains you're seeing.

the data binding magic incredibly cool , powerful, leave scratching head.