Dynamically change message style

[bkioshn]

Issue Description

I want to change the style of a message dynamically for example after the text to speech is finished reading, change the message box to some other style.

[amirduran]

You can start with this example:

#672

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.