Specify the properties to use for a tags display and weight using the Silverlight tag cloud data binding feature. 

Assign any enumerable collection of data, specifying the properties to use for each tag's Display and Weight.
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Customize a tag cloud's range of weights, and these will be mapped linearly to a corresponding scale (and vice versa).
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Customize the weight of a tag clouds data using the Silverlight weights and sizes feature.  

Items appearing in the cloud are fully templatable, allowing you to customize the format of tag content, or scale any content within a tag.
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Customize the format of content using the Silverlight tag cloud templatable feature.