Working in native MX to design the 'Pavement and Subgrade to existing pavement', and after I have created the scheme and worked with the 'Define Surfaces Wizard', the "Function Control" dialog box disappears from the screen. This is applicable to some other dialog boxes as well like the "Profile Surface Details" dialog box does not pop up.
You will need to 'Bring the Dialog in Front' from the "MX Status Monitor".
1. To activate the "MX Status Monitor", follow the link below:
2. Once the Status Monitor is active, right click to get the dialog box.
3. Hit the "Show Hidden Panels / Bring to Front". The panel should be displayed.