Hi,
My application have ten textbox , in tenth textbox control is here , i press the tab key control is moved in first one?
I don't understand your question. The tab key is basically handled by the form, and it will move from one control to another in order and then back around to the beginning based on the TabIndex proprety of control (which is an extender property provided by the form). This has nothing to do with the Infragistics controls.