diff --git a/src/kc/kcApp.cpp b/src/kc/kcApp.cpp
index d59e30f..fab6938 100644
--- a/src/kc/kcApp.cpp
+++ b/src/kc/kcApp.cpp
@@ -77,7 +77,8 @@ kcApp::kcApp(int w, int h, const char *l, int argc, char *argv[])
     _adlH(cmAdlNullHandle),_aiH(cmAiNullHandle),
     _statIdx(0),_pageList(NULL),_ctlList(NULL),_prH(cmPrNullHandle),_prefsFn(NULL),
     _stopTimerFl(false),_jsH(cmJsonNullHandle),_newPageFl(true),_incrColW(0),_colW(0),_horzBordFl(false),_horzBord(0),
-    _closeCnt(0),_ssCnt(0),_ssArray(0),_ssPhase(0),_ssUpdateFl(false),_printqH(cmTsQueueNullHandle)
+    _closeCnt(0),_ssCnt(0),_ssArray(0),_ssPhase(0),_ssUpdateFl(false),_printqH(cmTsQueueNullHandle),
+    _tlCtl(NULL)
 {
   // install a callback to cleanup when the app window closes
   // (the btn callbacks and _getApp() rely on a pointer to 'this' being found in kcApp.user_data())
@@ -423,6 +424,7 @@ void kcApp::_clearCtlList(bool mstrFl)
   if( mstrFl )
     mstr_grp->clear();
  
+  _tlCtl = NULL;
 }
 
 
@@ -1222,6 +1224,11 @@ void kcApp::_createTmln(  const cmDspUiHdr_t* m )
 
   cp->u.tmln.tlctl = new tlCtl(&_ctx,this,NULL);
 
+  // currently we only support one time-line control because
+  // we have not yet implmenented a method of providing
+  // timer callbacks to a list of UI controls
+  assert( _tlCtl == NULL ); 
+  _tlCtl = cp->u.tmln.tlctl;
 
   Fl_Widget* wdgt = cp->u.tmln.tlctl->initTimeLineCtlr(_menu,x,y,w,h);
 
@@ -1239,15 +1246,10 @@ void kcApp::_setTmlnValue( ctl_t* cp, unsigned instVarId, const cmDspValue_t* vp
     {
       switch(i)
       {
-        case kTmlnValArgIdx:
+        case kTmlnSelArgIdx:
           //tp->value( cmDsvStrcz(vp));
           break;
 
-        case kTmlnLblArgIdx:
-          {
-            const char* lbl = cmDsvStrcz(vp);
-          }
-          break;
 
         case kTmlnFileArgIdx:
           {
@@ -1907,12 +1909,13 @@ void kcApp::_callback(void* data)
     // to be diplayed in the console - all successive
     // times the return value from finalizePgm() is
     // ignored and the program is terminated.
+    /*
     if( _closeCnt == 1 && cc==0)
     {
       deactivate(); // send a strong hint that a problem occurred
       return;
     }
-
+    */
 
     // When all windows are windows are closed then the app.
     // will close - so hiding the application window
@@ -1949,7 +1952,11 @@ bool kcApp::_status_timeout_cb()
     _checkPrintQueue();
 
   if( !_stopTimerFl )
+  {
     _getEngMsg();
+    if( _tlCtl != NULL )
+      _tlCtl->onIdle();
+  }
 
   if( _ssUpdateFl )
   {
@@ -2129,8 +2136,11 @@ void kcApp::_ctl_cb(ctl_t* cp)
       break;
 
     case kTmlnTypeId:
-      //instVarId = cp->u.text.varIdArray[ kTmlnValArgIdx ];
-      //cmDsvSetStrz(&value,(cmChar_t*)cp->u.tmln.text->value());
+      {
+        instVarId = cp->u.text.varIdArray[ kTmlnSelArgIdx ];
+        unsigned selMarkerId = cp->u.tmln.tlctl->timeLineSelectedMarkerId();
+        cmDsvSetUInt(&value, selMarkerId );
+      }
       break;
 
     default:
diff --git a/src/kc/kcApp.h b/src/kc/kcApp.h
index d8659d9..777ccfc 100644
--- a/src/kc/kcApp.h
+++ b/src/kc/kcApp.h
@@ -137,11 +137,10 @@ private:
     kMetrLblArgIdx = 3,
     kMetrVarCnt    = 4,
 
-    kTmlnValArgIdx = 0,
-    kTmlnLblArgIdx = 1,
-    kTmlnFileArgIdx= 2,
-    kTmlnPathArgIdx= 3,
-    kTmlnVarCnt    = 4
+    kTmlnFileArgIdx= 0,
+    kTmlnPathArgIdx= 1,
+    kTmlnSelArgIdx = 2,
+    kTmlnVarCnt    = 3
 
   }; 
 
@@ -303,6 +302,7 @@ private:
   int             _ssPhase;
   bool            _ssUpdateFl; 
   cmTsQueueH_t    _printqH; // thread-safe queue for controlling access to the output console from multiple threads
+  tlCtl*          _tlCtl;
 
   void resize(int x, int y, int w, int h);