The modal form was only added recently.

To your specific question: no. the only spec-defined way that a modal form will 
exit is by having a callback from a question return SUBMIT, etc. Some forms 
browsers may support additional methods, but it is implementation specific.

Tim

From: galla rao [mailto:[email protected]]
Sent: Saturday, June 22, 2013 5:39 AM
To: [email protected]
Subject: [edk2] Hii Modal Form

Hello All

I created a modal form and it does not honor ESC key
to switch to a previous form. I think that is the expected behavior of the 
Modal Form.
In the UDK, setbrowser.dxe source code has functionality to prevent using ESC 
key when the form is modal

Does all BIOS vendors are supporting the Setbrowser which has support for Modal 
form
During my testing on one platform Modal forms behave expectedly
and on another platform it failed

Does it mean the BIOS vendor did not added the latest setbrowserdxe from 
UDK2010.SR1.UP1 to handle modal forms

Thank you All
Kindly respond
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