Using OpenCascade with GTK ?

Hello,

My laboratory is evaluating various solutions for implementing our project...
OpenCascade should surely be choose... but the choice for a linux widget library is stil open.
For moment we have evaluated QT succesfully.
But we'd like to evaluate GTK too and especially GTK-- which is the C++ wrapper for GTK.
Is there is any people who made the connection between OpenCascade and GTK ?
During our first test we have encountered a problem. The sigc++ library which is needed by GTK-- contains a 'Handle' function which conflicts with OpenCascade 'Handle' macro.

Is there is a workaround for this problem ?

Thanks for any help...

JMR