How do I add dialogues for system object?

looking to add system dialog functions for the following so they can be used:

SysCnds.prototype.PickSiblings = function (obj)

{

if (!obj)

return false;

// Get the current sol

var sol = obj.getCurrentSol();//return obj.solstack[obj.cur_sol];

var instances = sol.getObjects();

var select_all = sol.select_all;

// Index out of range: condition false (no wraparound)

if (instances.length != 1)

return false;

var inst = instances[0];

cr.clearArray(sol.instances);//TRUNCATE ARRAY TO 0 LENGTH

for (j = 0, lenj = sol.siblings.length; j < lenj; ++j)

{

if(sol.instances.length < lenj)

sol.instances.push(inst.siblings[j]);//inst.siblings.siblings.push(inst);

else

sol.instances[j] = inst.siblings[j];//.getInstanceByIID(sol.instances[j].iid);

}

}