Programmer mode is the most advanced version of Modest3D. It is not available by default, as it it too complex for users to use without extensive backgrounds in programming. To enable Programmer Mode, open up the settings windows, and type 1-3-3-7. This will create a new option under modes, called Programmer Mode. Select it to continue in Programmer mode.
Programmer Mode allows you to access the Engine behind Modest3D, and use the Editor in more ways than most users, and features considered too complex or unintuitive for an average user. Most conventions in most .NET languages are supported, such as Lists, for loops, for-each loops, etc.
In programmer mode, the context menu is essentially useless when it comes to picking things out in the menus, because of the vast featureset. Instead, you should get acquainted with typing what you need, after right clicking. This will search all nodes in programmer mode, allowing you to locate needed nodes with ease.