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extender control
comp., MS	Extendersteuerelement n (In ASP.NET, a control that encapsulates functionality that is implemented in JavaScript and that defines behavior in the browser. Extender controls are associated with existing Web server controls to add the extender's behavior to that control. For example, an extender control can add a watermark to any TextBox control or drag-and-drop behavior to a variety of ASP.NET Web server controls)