I have a custom data type "Table Editor", each cell contains RTE.
But when I want to add a link from Link Picker (or open edit source code) in this RTE, overlay with code window is locked.
Link Picker is locked until I click on it, but after click Link Picker is active, but RTE overlay closes.

I explored code for these elements in the Chrome Dev Tools and marked an oddity: Different places. Table overlay is deep inside page node. Link Picker overlay is inside "umb-editors" class that is after page node.

Function for init RTE in controller.js:

    function _editCell(cell) {
    vm.richTextEditor = {
        view: "/App_Plugins/Our.Umbraco.Tables/backoffice/views/tables.overlay.view.html",
        show: true,
        title: "Edit cell value",
        prop: {
            alias: "value",
            label: "",
            view: "rte",
            config: {
                editor: {
                    toolbar: [
                        "ace",
                        "removeformat",
                        "styleselect",
                        "bold",
                        "italic",
                        "underline",
                        "strikethrough",
                        "bullist",
                        "numlist",
                        "link",
                        "unlink"
                    ],
                    stylesheets: [
                        "/css/Jumpstart.css"
                    ],
                    maxImageSize: 500,
                    mode: "classic"
                }
            },
            value: cell.value
        },
        submit: function (model) {
            cell.value = model.prop.value;
            vm.richTextEditor.show = false;
            vm.richTextEditor = null;
        },
        close: function (model) {
            vm.richTextEditor.show = false;
            vm.richTextEditor = null;
        },
        error: function (error) {
        }
    };
}

Overlay layout in editor.view.html:

    <umb-overlay ng-if="vm.richTextEditor.show"
             model="vm.richTextEditor"
             position="right"
             view="vm.richTextEditor.view">
</umb-overlay>

How can I use overlay in a overlay correctly?
Why these overlays are in a different places?