Bug with designer attachToolbar in Windows

I did this:
dhtmlx.com/docs/products/dht … _cell.html

dhtmlx.com/docs/products/dht … olbar.html

bug border-top of attachToolbar in Windows

see code and test:

<!DOCTYPE html>

    <title>Page Title</title>
    <link rel="stylesheet" type="text/css" href="./dhtmlx/codebase/dhtmlx.css" />
    <script src="./dhtmlx/codebase/dhtmlx.js"></script>
        html, body {
            width: 100%;
            height: 100%;
            margin: 0px;
            overflow: hidden;
        #windows {
            position: relative;
            width: 100%;
            height: 100%;
            overflow: hidden;
        window.onload = function(){
            var layout = new dhtmlXLayoutObject(document.body, '1C');
            var win = new dhtmlXWindows();
            var w = win.createWindow("w", 20, 30, 400, 280);
            w.attachToolbar({items: [{type: 'button', text: 'Test'}]});


<div id="windows"></div>



Locally it seems like everything is fine. Could you provide us an image or demo to inspect it?
docs.dhtmlx.com/doku.php?id=othe … leted_demo

see the border-top of toolbar in windows

Add the next style:

.dhxwins_vp_dhx_skyblue div.dhx_cell_wins div.dhx_cell_toolbar_def div.dhx_toolbar_dhx_skyblue { border-top: 1px solid #a4bed4; }