Action Buttons are identified with a white triangle symbol. Action buttons are used in conjunction with scripting. There are two types of action buttons: Make movie and Toggle.
The Make movie Action button will read a Show Instances command in the script when the button is clicked on in Capture, Code or Report mode and then make a movie.
A Toggle button is generally used in scripting with Button State commands. For instance, a script can read the state of the button and change its name based on whether the toggle button is up or down. They do not create an instance or a label so it will not have any effect on the Timeline or Matrix.