Hi everybody! I'm trying to figure out how I can set the "order" attribute of the tree tag with the value of a variable: For example: <dtml-unless treeOrder> <dtml-call "REQUEST.set('treeOrder','title')"> </dtml-unless> <dtml-tree sort=treeOrder> <a href="&dtml-absolute_url;" target="previewPanel"><dtml-var title></a> </dtml-tree> By doing this, I get the following error: Error Type: AttributeError Error Value: treeOrder Same thing happens whenever I try with: sort="treeOrder" sort=&dtml-treeOrder; sort="&dtml-treeOrder;" Currently I am using this solution, which works, but it isn't clean: <dtml-unless treeOrder> <dtml-call "REQUEST.set('treeOrder','title')"> </dtml-unless> <dtml-if expr="treeOrder=='title'"> <dtml-tree sort="title"> <a href="&dtml-absolute_url;" target="previewPanel"><dtml-var title></a> </dtml-tree> <dtml-elif expr="treeOrder=='id'"> <dtml-tree sort="id"> <a href="&dtml-absolute_url;" target="previewPanel"><dtml-var title></a> </dtml-tree> <dtml-elif expr="treeOrder=='user'"> <dtml-tree sort="user"> <a href="&dtml-absolute_url;" target="previewPanel"><dtml-var title></a> </dtml-tree> <dtml-elif expr="treeOrder=='date'"> <dtml-tree sort="date"> <a href="&dtml-absolute_url;" target="previewPanel"><dtml-var title></a> </dtml-tree> </dtml-if> Does somebody knows how to render this variable? Thanks in advanced, Josef.