3ds Max :: How To Rotate An Object In LOCAL Coordinate Mode

I have 3dsmax 2013 and would be forever grateful for a solution to a parameter wiring problem. In simple question form: How do you wire a slider helper to rotate an object in LOCAL coordinate mode? I've tried it a hundred times and it's not wiring the rotation parameter in LOCAL coordinate mode, it defaults to world or view coordinate mode. (Look at gif attachment)

To replicate this issue in 3dsmax 2013, simply create a cube in the viewport.

In perspective view(or any other), switch to local coordinate mode and rotate it off center any way you wish. Now create a helper of manipulator-->slider type. Right click on the slider, click wire parameter-->value and link to the Box rotation in Z. Make the connection through a one way (--> wiring from slider to box.

Now when you move the slider value, the box doesn't rotate in local coordinate mode, it rotates in world coordinates or view coordinates. Whatever it is, it's not local. What is the expression for LOCAL coordinate rotation? By default the expression in the slider box of wire parameter dialog is z_rotation(or something like that). Looking at the maxscript reference, I've tried Local_Euler_z_rotation and other stuff. I can't figure out how to just get a local coordinate mode rotation through a simple wire parameter link to a slider.