Dynamic ID for iframe(Modal)

I am attempting to switch the focus to a modal whose idea contains a dynamically generated ID. This is in an iframe, but also a modal that pops up. Unfortunately I tried to switch to the active element and it is not able to find it. Anyone know how to handle dynamic id's without using xpath?

Instead of ID, you can go with class, css, name etc.
Else you can use storeAttribute | //*[@class='stnewrecord']@id | variable

Here you can get dynamic ID in variable, and then you can use it.