Get path name of block or line
path=getfullname(handle)
path=getfullname(handle) returns the full
pathname of the block or line specified by handle.
getfullname(gcb) returns the pathname of
the block currently selected in the model editor's window.
The following code returns the pathname of the line currently selected in the model editor's window.
line = find_system(gcs, 'SearchDepth', 1, 'FindAll', 'on', ...
'Type', 'line', 'Selected', 'on');
path = getfullname(line);