Target CSS selector that should be used instead of TargetControlID property. You can use TargetSelector property when you need populate extender functionality on several page elements(controls) at once.
'Declaration
Public Property TargetSelector As System.String
public System.string TargetSelector {get; set;}
Remarks
When you using this property the extender control will be not registered via ScriptManager. Note, this property takes priority over TargetControlID property.
