Hi.

You cannot. You have to calculate x, y and add them to your OpenUserObjectWithParm command:

int li_ret
int li_x, li_y

// calculate li_x, li_y

li_ret = this.OpenUserObjectWithParm(n_cst_myuserobject, "param1", li_x, li_y)

But you also need to know your userobject's width and height to do the calculations. These can be found like this:

int li_ret
int li_x, li_y
integer li_width, li_height
n_cst_myuserobject luo_cst_myuserobject

luo_cst_myuserobject = create n_cst_myuserobject

li_width = luo_cst_myuserobject.width
li_height = luo_cst_myuserobject.height

if isvalid(luo_cst_myuserobject) then destroy luo_cst_myuserobject

// calculate li_x, li_y

li_ret = this.OpenUserObjectWithParm(n_cst_myuserobject, "param1", li_x, li_y)

By the way, as your userobject is visible and not non visual, it's name should start with u_ (u_cst_myuserobject).