Hi,

if you click the button in a record inside the tree view, you can access the field values of the same using the self.

Example: Suppose if the sale order tree view is editable and there is a button in the lines, once the button of any line is clicked you can access the values of that line using self, make sure the button is of type object which call a python function, inside the function you can access rest of the field values using  self.field_name

You can iterate self over the for loop to prevent singleton error.

Thanks