Is there a component (preferably free) to help me draw Message Sequence Charts ?
If not, how would you do it?

Update: btw, I had to clearly indicate that I was not trying to create an application so that users could manually draw MSC, otherwise I just used TMS Diagram Studio (see my "answer" below).
What I want to do is automatically create the MSC from the trace logs. So, I will write some code to analyze the log file, and then I would like the components to let me define the columns, and then add arrows to display the sequence of messages in the trace log.
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