'Map Init' is during the loading screen. Therefore, you must display dialog buttons, leaderboards, and multiboards AFTER the game starts. Use event - Elapsed game time is 5 seconds (or whatever).
For dialog boxes, you need
-->Variable for the box
-->Variable for every button
Then you must
-->Define all the buttons using variables
-->Create the box using variable
-->SHOW the dialog box to players.
Then use the event 'Dialog box button is clicked'
-->If (button clicked) equal to this button
-->If (button clicked) equal to that button
-->If (button clicked) equal to other button button
Do search for 'dialog boxes', we do have many many posts.