Dynamic means changing. You can have your menu output prompts to the user. Argon does this, where it says "Welcome" on the top. Notice that this changes depending on what you do. Doing this is simple. Text will overwrite itself on the screen. Here's an example of Argon's dynamic Menu
//Setting up menu stuff here
Text(1,45,"Drawing...")
//Drawing stuff here
Text(1,45,"Welcome! ")
//Input goes here
You can do this with options being on and off, too such as in Chromium's options menu:
If X=1
Draw Stuff
If X=2
Draw Different Stuff