I have a question about Mobile controls, in extelib 8.5.3

I am trying to understand how to pass the clicked row unid to another appPage. I have my xe:djxmLineItem inside a repeat and the rows are displayed nicely. In another appPage I want to get hold of the item clicked, name or unid so I can open the document

I have read the mobile tutorial, but could not find an example of this.
In the sample it looks like there is a document data source, but I can't find the unid in order to open a document in an appPage, not sure I undertand that bit.

my repeat is fetching data outside notes, so I cannot connect the clicked item to a document source. I only want the clicked name or id so I can make a lookup based on that

thanks for your help.

Thomas