How to add list dynamically using xml views in sapui5?

Hi All,

I am working on Mobile Application,facing a problem where I am click on a button the list added to the view.

but when I am click on the button for the first time the list added to the view and next time onwords list data is overriden not added to the existing list.

in the above screen short when I am click on ADDITEM it shows the dialog as shown below

after click on save button the list to be added to already existing list,But the data to be overriden.

How to resolve this?

Please help me,Thank You in advance.