1. A computer-implemented method in a graphical modeling environment, the method comprising: providing a control initiator, the control initiator connected to a control signal splitter; providing a first subgraph in the modeling environment, where: the first subgraph includes one or more blocks, and the first subgraph is connected to the control signal splitter; providing a second subgraph in the modeling environment, where: the second subgraph includes one or more blocks, and the second subgraph is connected to the control signal splitter; and using data dependencies between the first subgraph and the second subgraph to determine control signal splitter initiation execution order between the first subgraph and the second subgraph.