From Xojo Documentation

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

Supported for all project types and targets.

If True, applies the bold style to the control's caption and/or its text content if any.


Mac apps can only display font styles that are available. You cannot force a font to display in bold or italic if it does not have bold or italic variations available. In this situation, the Bold property will not affect the font.