void BuildPadList(Vessel v)
        {
            launchpads = null;
            pad_list = null;
            var pads = new List<ExBuildControl.IBuilder> ();

            for (int i = 0; i < v.Parts.Count; i++) {
                var p = v.Parts[i];
                pads.AddRange (p.Modules.OfType<ExBuildControl.IBuilder> ());
            }
            if (pads.Count < 1) {
                control = null;
            } else {
                launchpads = new List<ExBuildControl> ();
                int control_index = -1;
                for (int i = 0; i < pads.Count; i++) {
                    launchpads.Add (pads[i].control);
                    if (control == pads[i].control) {
                        control_index = i;
                    }
                }
                if (control_index < 0) {
                    control_index = 0;
                }
                var pad_names = new List<string> ();
                for (int ind = 0; ind < launchpads.Count; ind++) {
                    var p = launchpads[ind];
                    if (p.builder.Name != "") {
                        pad_names.Add (p.builder.Name);
                    } else {
                        pad_names.Add ("pad-" + ind);
                    }
                }
                pad_list = new DropDownList (pad_names);

                Select_Pad (launchpads[control_index]);
            }
        }
 void FindSites()
 {
     available_sites = ExSurveyTracker.instance.FindSites (vessel, 100.0);
     if (available_sites == null || available_sites.Count < 1) {
         Highlight (false);
         site = null;
         site_list = null;
     } else {
         var slist = new List<string> ();
         for (int ind = 0; ind < available_sites.Count; ind++) {
             slist.Add (available_sites[ind].SiteName);
         }
         if (!available_sites.Contains (site)) {
             Highlight (false);
             site = available_sites[0];
         }
         site_list = new DropDownList (slist);
     }
     Debug.Log (String.Format ("[EL SS] {0}", site));
 }