Ok i found a solution here (Have difficulty understanding math transform. ),
the problem was that the i use "min-max-mates" for each joint of the robot. So when i supress the mates i can modify the transforms. After unsupressing the mates the assembly jumps back to initial position.
to solve that problem i just "fix" the ToolCenterPoint of the Robot first, unsupress, and then delete the "fixture" so the mates change there values while unsupressing. Thats how it works =)
Hope ill find the "fixture" attribute for the api... just tried it manually in Solidworks. Ill post the code when it works