Thank you for writing.
You can subscribe to the SpellingFormShowing
event and hide or disable the "Add To Dictionary" button accessing the respective control via the Form.Controls collection:
sender, SpellingFormShowingEventArgs e)
//e.SpellingForm.Controls["buttonAddToDictionary"].Visible = false;
I hope this information helps. Should you have further questions, I would be glad to help.
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