diff --git a/fixtracks/widgets/detectiontimeline.py b/fixtracks/widgets/detectiontimeline.py
index f628312..aa498f8 100644
--- a/fixtracks/widgets/detectiontimeline.py
+++ b/fixtracks/widgets/detectiontimeline.py
@@ -58,6 +58,8 @@ class DetectionTimeline(QWidget):
         self._trackone = trackone_id
         self._tracktwo = tracktwo_id
         self._data = detectiondata
+        self._rangeStart = 0.0
+        self._rangeStop = 1.0
         self._width = 2000
         self._stepCount = 200
         self._bg_brush = QBrush(QColor(20, 20, 20, 255))
@@ -76,12 +78,13 @@ class DetectionTimeline(QWidget):
         font.setPointSize(15)
         font.setBold(False)
 
+        self._scene = QGraphicsScene(QRectF(0, 0, self._width, 50.))
+        self._scene.setBackgroundBrush(self._bg_brush)
+
         self._view = QGraphicsView()
         self._view.setRenderHints(QPainter.RenderHint.Antialiasing | QPainter.RenderHint.SmoothPixmapTransform);
         self._view.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding)
         self._view.fitInView(self._scene.sceneRect(), aspectRadioMode=Qt.AspectRatioMode.KeepAspectRatio)
-        self._scene = QGraphicsScene(QRectF(0, 0, self._width, 50.))
-        self._scene.setBackgroundBrush(self._bg_brush)
 
         t1_label = self._scene.addText("track 1", font)
         t1_label.setDefaultTextColor(self._t1_pen.color())
@@ -133,6 +136,14 @@ class DetectionTimeline(QWidget):
             if t2_coverage[i]: self._scene.addLine(pos[i], 17, pos[i], 32., pen=self._t2_pen)
             if other_coverage[i]: self._scene.addLine(pos[i], 34, pos[i], 49., pen=self._other_pen)
 
+    @property
+    def rangeStart(self):
+        return self._rangeStart
+
+    @property
+    def rangeStop(self):
+        return self._rangeStop
+
     def fit_scene_to_view(self):
         """Scale the image to fit the QGraphicsView."""
         self._view.fitInView(self._scene.sceneRect(), Qt.KeepAspectRatio)
@@ -147,9 +158,9 @@ class DetectionTimeline(QWidget):
         start_pos = x - w/2 + scene_width/2
         end_pos = x + w/2 + scene_width/2
 
-        range_start = np.round(start_pos / scene_width, 3)
-        range_end = np.round(end_pos / scene_width, 3)
-        self.signals.windowMoved.emit(range_start, range_end)
+        self._rangeStart = np.round(start_pos / scene_width, 3)
+        self._rangeStop = np.round(end_pos / scene_width, 3)
+        self.signals.windowMoved.emit(self._rangeStart, self._rangeStop)
 
 # TODO add method to change window size
  
diff --git a/fixtracks/widgets/tracks.py b/fixtracks/widgets/tracks.py
index 7ec07e8..4c262d3 100644
--- a/fixtracks/widgets/tracks.py
+++ b/fixtracks/widgets/tracks.py
@@ -11,7 +11,7 @@ from PySide6.QtWidgets import QSpinBox, QSpacerItem, QFileDialog, QProgressBar,
 from fixtracks.utils.reader import PickleLoader
 from fixtracks.widgets.detectionview import DetectionView
 from fixtracks.widgets.timeline import Timeline
-
+from fixtracks.widgets.detectiontimeline import DetectionTimeline
 
 class PoseTableModel(QAbstractTableModel):
     column_header = ["frame", "track"]
@@ -108,8 +108,8 @@ class FixTracks(QWidget):
         self._progress_bar.setValue(0)
         self._tasklabel = QLabel()
         
-        self._timeline = Timeline()
-        self._timeline.signals.changed.connect(self.on_windowChanged)
+        self._timeline = DetectionTimeline()
+        self._timeline.signals.windowMoved.connect(self.on_windowChanged)
         self._windowspinner = QSpinBox()
         self._windowspinner.setRange(100, 10000)
         self._windowspinner.setSingleStep(100)
@@ -208,8 +208,11 @@ class FixTracks(QWidget):
 
         left_trackid = 1
         right_trackid = 2
-        start_frame = self._timeline.sliderPosition - self._windowspinner.value() // 2
-        stop_frame = self._timeline.sliderPosition + self._windowspinner.value() // 2
+        max_frames = np.max(self._dataframe.frame.values)
+        start = self._timeline.rangeStart
+        stop = self._timeline._rangeStop
+        start_frame = np.floor(start * max_frames)
+        stop_frame = np.ceil(stop * max_frames)
 
         df = self._dataframe[(self._dataframe.frame >= start_frame) & (self._dataframe.frame < stop_frame)]
         assigned_left = df[(df.track == left_trackid)]
@@ -235,7 +238,7 @@ class FixTracks(QWidget):
         self._progress_bar.setValue(0)
         if state and self._reader is not None:
             self._dataframe = self._reader.data
-            self._timeline.setRange(np.max(self._dataframe.frame.values), self._windowspinner.value())
+            self._timeline.setDetectionData(self._dataframe)
             self.populateTables()
 
     def on_save(self):
@@ -251,8 +254,8 @@ class FixTracks(QWidget):
     def on_assignRight(self):
         pass
 
-    def on_windowChanged(self, value):
-        logging.info("Timeline reports window change")
+    def on_windowChanged(self, start, stop):
+        logging.info("Timeline reports window change to range %f %f percent of data", start, stop)
 
         self.populateTables()