[nanogui] to receive event only from a YES NO window

[guylecordier]

Hi all,

I use nano-x with a touchscreen on an eCos and NIOSII platform.
I have to display some YES NO window which cover partially the screen.
I would like to receive events only from these YES NO buttons or from that 
window but not from other visible buttons/windows.
I don't see how I can do that with a touchscreen or a mouse. 
GrSetFocus() seems only for the keyboard events. 

Could someone help me?
Thanks

Guy