I've got a dxGrid which renders like this in Chrome:
The same grid when seen in Edge doesn't shows tooltips:
Is this a bug? If yes, is there a way I can forcefully show a tooltip on Edge?
There is no bug. It works fine. If you're really interested in forcefully showing a kind of tooltip, use cellTemplate
cellTemplate: function(container, options) {
container.attr("title", "Your tooltip data goes here");
}