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Which GWT component to be used for the trend chart?

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Friends, I have never worked with GTW and for that matter any web application framework. But as part of my job I have to make few decisions (and code) regarding which UI component to be used for the below scenario. I have no clue. Please help.

I have a trend chart (Please see in the attachment). On the hover to the particular point on this chart, I want to display few values, These values are strings (up to 255 characters) and number values can be 1 to 200.

I have below questions:

1. Should the values be displayed on the mouse hover action?
2. Should the values be displayed in the tool-tip? (Wouldn't it be a clutter to show so much of information?)
3. Is there any other component for such a requirement?
4. Other?

Thanks much,
Filename: trendchart.bmp
File size: 466 Kbytes
It is sorta covered in the JavaRanch Style Guide.
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