This attribute propagates trajectories whenever you click OK or Apply on the Orbit Properties page.
Astrogator <Satellite Object Path> SetValue PropOnApply <Boolean>
Set this attribute to true to run the MCS when you click Apply. This attribute should be set to false if you want to close the Properties Browser for the satellite without running the MCS. This attribute has no effect on Connect operations.
Astrogator */Satellite/Satellite1 SetValue PropOnApply true
STK Programming Interface 11.0.1