Directory Page enabling of Next button even if Space Required is Greater

The Directory Page next button doesn't become enabled if the Space Required is greater than available space. But I want a pop-up or something to come up which tells the user explicitly that he does not have enough disk space in that particular drive.
I have written a code which checks whether there is enough disk space when the user leaves the directory page. I want that same code to be executed without the Next button being disabled. Please help me.🙁

Use DirVerify and GetInstDirError.

But the DirVerify command can only be used from within a PageEx..
I want our default Directory Page Next button to be enabled. And alo I'm using the MUI.
Please help..🙁

If you're using the MUI, read the MUI readme. It has a define that adds DirVerify for you.

Kichik,
The VerifyOnLeave define works. Thanks a lot...