The function to unpin secondary tile

unpinSecondaryTiles.js

function unpinByElementAsync(element, unwantedTileID) {

    var selectionRect = element.getBoundingClientRect();
    var buttonCoordinates = { x: selectionRect.left, y: selectionRect.top, width: selectionRect.width, height: selectionRect.height };
    var placement = Windows.UI.Popups.Placement.above;

    var tileToDelete = new Windows.UI.StartScreen.SecondaryTile(unwantedTileID);
    
    return new WinJS.Promise(function (complete, error, progress) {
        tileToGetDeleted.requestDeleteForSelectionAsync(buttonCoordinates, placement).done(function (isDeleted) {
            if (isDeleted) {
                complete(true);
            } else {
                complete(false);
            }
        });
    });
}