Threads with xamarin forms (pcl)

Hello mates,

i have a pcl project for 2 implementations (android and iOS).

My app has items which read from a sqlite database. I want to charge the first two items and while i'm working with them on the screen load all the rest of them in a list.

but i don't know how to launch the process in background while i'm working with the first two items on the screen. I have a navigation bar so the unloaded items are not on the screen.

Now, i load a item when i choose it (synchronous) but i would like to try to load them before choosing with a background task.

Any idea?

Thanks in advance