i would like to nest different conditional statements in a tools xml file: <inputs> <conditional name="tophat_input"> <param name="type1" type="select" label="input file format" optional="false"> <option value="fasta" selected="true">FASTA</option> <option value="fastqsolexa">FASTQ-Solexa</option> <option value="fastqsanger">FASTQ-Sanger</option> </param> <when value="fasta"> <conditional name="paired_end_fasta"> <param name="type2" type="select" label="Paired end reads"> <option value="yes">Yes</option> <option value="no" selected="true">No</option> </param> <when value="yes"> .... how do i access type2? #if $tophat_input.paired_end_fasta.type2=="yes": #--value=test #end if doesnt work! thanks mat