Grid Animator
See how to animate the grid columndefinition or rowdefinition object in silverlight to create a smooth transition for collapsing and expanding grid rows or columns.

This is an example of how to animate the collapsing and expanding of a grid control's row or column in Silverlight 2...

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Blog Post: http://programmerpayback.com/2008/11/08/animate-collapsing-a-grid-column-or-row-in-silverlight/