Dimming on layout window any given area?

Hi Andrew,

    Thanks actively helping us.

I have question like this, we can do "dimming" on layout windows, through display options.

We can do dimming based for conditions ie scope. However is there any chance for dimming on layout window with given list of  coordinates?

Example, I would like to dimm the layout window from (X1,Y1) to (X2,Y2). Layout should be in read mode and nothing is selected.

Regards,

Venkatraman