Now create a New Custom Event, and name it ShowMessageBox.
Now insert a Change Active Interface event to start out the script. Have it change the new active interface to your Messages HUD. The Current Active Interface setting is personal preference but for this tutorial it will be set to Hide.
Create a Change Existence Event. Select your Messages HUD and choose Lines 1-3 and your Yes and No buttons. Make them existent.
Insert a Change Field Value/Text Event. Select your Messages HUD and choose Lines 1-3. Set their value to Blank with ONE space.
The finished product should look like this:
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