Adding netbeans keyboard shortcut

Hi All,
I work in an app which is developed on netbeans platform.

I need to add new keyboard shortcut to change focus from 
Tree navigator to property sheet.

How do I do that?

When I searched for solution all I get is changing from tools

But I need to change netbeans code so that when our app is launched shortcut should work.

Any hint is appreciated.

Thank you,
Sandhya