To more easily support custom code in Chameleon-based themes, two new controls were added: CustomCondition and CustomAction. From the updated Introduction to Chameleon: Condition Controls post... CustomCondition (<CSControl:CustomCondition />) CustomCondition
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Read the complete post at http://getben.com/archive/2007/03/15/New-Custom-Code-Condition-and-Action-Chameleon-Controls.aspx