Drag & drop hints are lost in Telerik's RadControls for ASP.NET AJAX

I have a Telerik tree and drag & drop node move is in action. But then I applied a theme (bought from somewhere) to the overall design of my site, and now, the hint are gone. When you drag a node, some horizontal hint lines appear, so that you can understand that开发者_如何学编程 if you release your node (drop it) where it would be dropped.

Try adding the following CSS to the page. It will force the styles upon the TreeView drop hint.

.rtDropAbove, .rtDropBelow {
    border: 1px dotted black !important;
    font-size: 3px !important;
    height: 3px !important;
    line-height: 3px !important;
    margin-top: -1px !important;
}

.rtDropAbove {
    border-bottom: 0 !important;
}

.rtDropBelow {
    border-top: 0 !important;
}

Something's z-index property is messing up with Telerik's RadTree. It's all z-index stuff.