[Closed] Constrain controlled by Attribute holder

Hi
I have a rigging problem .Im looking for the way that for example 1 object is position constrainted to 3 other obj and i want to choose the weight of constrainted obj controlled by attribute Holder. Example radius button 1 selected go to the 1 object position 2 go to second obj position etc. when main obj is constraint to 2 obj no problem (wiring) (float expression) can do the job but in 3 obj i dont know what to do. further is there any way for example in attrebue holder create a pickbutton (then select an object) then constrain a hand CNT to the selected object.

If anyone atleast tell me how can i find the way or site to do this, Thanks in advance