Descriptions not being shown as tooltips


I have set descriptions for different components like Button and Table Rows (using ItemDescriptionGenerator) in my application but none of them is being shown as tooltip on the browser. I am not sure what the issue is and how to rectify it. Can anyone help me?
I am using Vaadin 7.3.2



can you state the browser/platform you’re experiencing this on? At least a quick test on Firefox and Chrome on OSX it seems that both features work.