Here is another topic about the Simple Modal I am starting to use.
I would just like to point out that handler names may be somewhat confusing, especially in regard to standard components. For example, I keep losing time having to research which is which between Submit Button Logic and On Submit Button.

I would like to suggest the following changes :
Submit Button Logic → Submit Button Label Logic (otherwise, I’m always thinking it’s what’s going to happen when I click, and it would be consistent with the Close Button Label Logic)
PlaceholderLogic → Placeholder Logic (missing space typo)
On Close Button → On Close Event (closing can happen when clicking outside the modal, not only by clicking the button, and it would be consistent with other components)
On Submit Button → On Submit Event (would be consistent with other components such as Form)