MATLAB: Highlight to Source Programmatically

highlight to sourcesimulink

Hi, I wanted to get the source of a block in Simulink. Normally in Simulink one can click on the signal line of the block and select 'Highlight to source'. The line is then highlighted all the way up to the source of the signal line even through nested buses, subsystems and so on. I need to get the source of a signal line programmatically. Is there any way to do this.. Any help or tips will be highly appreciated. i am using MatlabR2009b but if a command is availbale say in Matlab 2011 b I am open to using that too…
Thanks

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