How to show custom dialog in workflow process

There are cases while working with workflows we need to show some custom dialogs box which will have some dynamic values based on some conditions.

To achieve this following steps needs to be followed.

1. If the dialog box that you want does not exist out of box then create a new dialog box with a unique dialog id having attributes retrieving values the way you want. 
2. Create sigoption and maxmenu entry with the same name as the unique id that you used for dialog box.
3. Now use this maxmenu id in the action attribute of the interaction node for the workflow when you want to the dialog box.