How can I create a Dynamic Subsystem Mask (with variable number of edit box) in Simulink?

Hi,

I would like to create a Simulink Mask from which the user can set a number of elements from a pop-up list and then, depending on the number "n" of elements selected from the menu, the Mask shows "n" edit box. The user should then enter "n" numeric values.

Something similar is expleined in this link but here you can have only one edit box that appears only when the user selects the "User-defined" option.

My will is to create a mask that shows 3 edit box when I choose the "3" option in the pop-up list, 4 edit box when I choose the "4" option and so on.

Thank you!