You don't need to force mouseclicks most of the time. Just pretend a click.
Example
In your game you have a sprite that acts like a button, and when the user clicks on it, the buton sprite changes its look and something else is triggered.
+On myButtonSprite left clicked
-> myButtonSprite: Set animation frame to 2
-> do something awesome
Now you want to automatically click on that button for a tutorial level. Instead of some forced mouseclick you just use all the actions above combined with another condition, e.g.
+Tickcount = 180
-> myButtonSprite: Set animation frame to 2
-> do something awesome
If this doesn't help in your case, please be more specific.