>If you make the LinkControl property hold the object reference (just this.LinkControl = thisform.TextBox1) then you would just do:
>this.Left = this.LinkControl.Left + this.LinkControl.Width + this.LinkLeft

Done!

LOCAL olinkcontrol
olinkcontrol = EVALUATE(this.link_control)
this.top = olinkcontrol.top + this.link_top
this.left = olinkcontrol.left + olinkcontrol.width + this.link_sep