RCDC - Control Visibility depending on two non boolean attributes

Hi,

I have used before a boolean field to set the visibility of a control, e.g:

my:Visible="{Binding Source=object, Path=isMyVisibleAttrib, Mode=TwoWay}"

But now I need to do the same thing depending on two non boolean attributes and I really would like to avoid creating a new 3rd attribute to represent the logical value of those 2 attributes (and avoid all the required MPR/WF to maintain the values accurate)

Any sugestion?

Many thanks,

JD