For example, we have to execute graph B, only if another graph A finished without any error. So there is some kind of relation between these graphs. We can achieve this behaviour by creating a graph event listener. We create a listener for graph finished OK event of graph A and choose an execute graph task type with graph B specified for execution. If we create another listener for graph B with execute graph task with graph C specified, it will work as a chain of graphs.

Figure 24.3. Event source graph isn't specified, thus listener works for all graphs in specified sandbox