zIndex

the stack order of the component

number zIndex;

Example

webix.ui({
    view:"window",
    zIndex:1,
    ..//config
});

Details

Use zIndex:"auto" for setting zIndex equal to that of its parent.

By default, a modal window has the same zIndex as the previous absolutely positioned element, but because of the attaching order the modal layer will be on top anyway.

If you have not checked yet, be sure to visit site of our main product Webix javascript ui library and page of javascript popup window product.