Represents the label of the button.
If this property is not set, it returns the label set for this button in Calcapp Creator.
Sets the button label to "Submit data" if Field1 is valid (by consulting its Valid property). If Field1 is not valid, the button label is set to "Submit data ⚠️" (with a warning triangle). You can also consider disabling the button if Field1 is invalid using the Enabled property, or making it invisible using the Visible property.