[Name] prepareddialogid [Required] false [Attribute Constraints] This attribute may not be specified in conjunction with the src, type or namelist attributes. [Type] ECMAScript Expression [Default Value] none [Description] An ECMAScript expression which returns a dialog identifier of a dialog previously prepared by the execution of a dialogprepare element. If the specified dialog identifier refers to an unknown dialog or a dialog that has already been executed, by way of another dialogstart element, an error.dialogwrongstate event is thrown. [Valid Values] 
a valid dialogid