MobileMessageBox.Title
From Xojo Documentation
Property (As String )
aMobileMessageBox.Title = newStringValue
or
StringValue = aMobileMessageBox.Title
New in 2020r2
Supported on Mobile.
or
StringValue = aMobileMessageBox.Title
New in 2020r2
Supported on Mobile.
The title of the message box, which appears at the top.
Sample Code
Set the title:
MessageBox1.Title = "Warning"