I’m trying to make my login modal window(bootstrap modal) and drop-down menu(attached to the cell as an object, as I don’t want to use dhtmlx menu) to be visible in other cells. I set z-index in .css file, but no result.The bellow is a header part of my dhtmlx layout:
mainLayout = new dhtmlXLayoutObject({
    parent: "layoutObj",
    pattern: "5I",
    skin: 'dhx_web',
    cells: [
        {
            id: "a",
            header: false
        },
        {
            id: "b",
            collapsed_text: "Expand to view 'b' cell"
        },
        {
            id: "c",
            header: false,
            collapsed_text: "Expand to view 'c' cell"
        },
        {
            id: "d",
            collapsed_text: "Expand to view 'd' cell"
        }
    ]
});
mainLayout.cells("a").attachObject("header-cell");
mainLayout.cells("a").setHeight(68);
Thanks in advance.