Hi, I'm trying to get a wrapper from someone else working and I found this "refresh_on_change" attribute in his select boxes which are filled using the dynamic_options feature: <param name="col_type" type="select" label="Select column type" refresh_on_change="true" display="radio" dynamic_options='get_column_type(library_file)' help="" /> <param name="polarity" type="select" label="Select polarity" refresh_on_change="true" display="radio" dynamic_options='filter_column(library_file,col_type)' help="" /> ... When searching the documentation/wiki I do not find a reference to this, but it would be a nice option to have ;) Question: is there any way I can force a refresh when the user selects another option from such a select box. As you can see in the example above, this is needed because the next select box has its dynamic options built up by a function that takes the value from the previous select (col_type - highlighted above) as an input parameter. Currently this tool only works by showing each select in its own <page> , which is a deprecated option and prevents the tool from being used in a workflow... :( Thanks for your help! Best regards, Pieter Lukasse Wageningen UR, Plant Research International Department of Bioinformatics (Bioscience) Wageningen Campus, Building 107, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands T: +31-317481122; M: +31-628189540; skype: pieter.lukasse.wur http://www.pri.wur.nl<http://www.pri.wur.nl/>