Checkpoint for SWT java tree with buttons in second column

Does anyone know how to get checkpoints working for SWT java trees with multiple columns where the second column contains objects.
The checkpoint always fails to compare the second column. I can only assume that it is because it contains an object itself rather than straight text.
I have attached a screen shot of my dialog.

I can't seem to access the RO methods either of the tree.

I also am getting an error when I try:
JavaWindow("PSSuniversal Configurator").JavaWindow("Configure Module Parameters").JavaTree("1 - PSSu E S 2AI U").GetColumnValue("#0", "#0")
I get:
The statement contains one or more invalid function arguments.

But if I use:
val = JavaWindow("PSSuniversal Configurator").JavaWindow("Configure Module Parameters").JavaTree("1 - PSSu E S 2AI U").GetColumnValue("#0", "")

Then I get only the first column's text as a result for val - "Range selection"

I appreciate any help with this.
I was thinking of trying to use RegisterUserFunc and override GetColumnValue but I suspect this will also fail.