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Property (As Boolean )
aTextEdit.AllowSpellChecking = newBooleanValue
BooleanValue = aTextEdit.AllowSpellChecking

New in 2019r2

Supported for all project types and targets.

If True, words that are believed to be misspelled are underlined.

Sample Code

This example is in the Initialized event of a TextArea:

Me.AllowSpellChecking = True