Show the internal sketch

Hi,

I am started working in Creo elements 5.0.

I have created a feature with an internal sketch and I want to use this internal sketch to give geometric constraints for the next sketch, but I could not make visible or select the internal sketch. Please anyone tell me that how to make visible or use this sketch to give geometric constrain for the next / other sketch.

Thanks in-advance.

Regards

Perumal