Hi,
 
 

> What are X, Y, and Z meant to be? Do you mean that you want child items to 
> have different column types from their parents?
 

The first column should only be used by first level of elements. The next 
column by the next level of items until the last column should only be used by 
the leaves of the tree. I was in hope that my textual graphic will already a 
pricture of the structure. Sorry that id did not. I have no idea how to 
describe in much more detail, because it is as simply as already mentioned :-(

Maybe as another use case, like a file chooser. So a path structure should be 
presented as:

/dir1/subdir1/file1
/dir1/subdir1/file2
/dir1/subdir2/file3
/dir2/subdir3/file4

Should become:

dir1
     subdir1
             file1
             file2
     subdir2
             file3

dir2
     subdir3
             file4

Can you catch me?

Regards
 Klaus
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