Tooltip size

I am finding the tooltip option for a datagrid very useful however my tooltip seem to be far to small - the text is blown up and bold in some of the themes and i have scrollbars which I cannot use as it is a tooltip. The screenshot of the tooltip in the documentation looks perfect how do I achieve this? I tried all the themes to see whether this i caused by the default theme, no luck. Update: The tooltip form seems to struggle when there is more than two columns - i now have two columns and the form diplays the information just fine.
1 answers

Would you mind posting a screenshot?