I have a graph like this jsFiddle code
Now on plotHover i can see the selection of the bar.How to get a dialog to automatically appear on plotHover or as soon as we focus on it.?
Dialog like this 
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Use technique from this example (click enable tooltip below the chart to see the tooltip on hover) http://people.iola.dk/olau/flot/examples/interacting.html
If the tooltip is really suppose to look like the one you’ve pasted it is simple matter of styling with css.