diff --git a/ChartingSpace/TimeMachine.js b/ChartingSpace/TimeMachine.js
index 71122a7d9..0d2fdd1db 100644
--- a/ChartingSpace/TimeMachine.js
+++ b/ChartingSpace/TimeMachine.js
@@ -394,7 +394,7 @@ function newTimeMachine () {
   }
 
   function panelPhysics () {
-    if (thisObject.container.frame.isInViewPort() && canvas.chartingSpace.viewport.zoomTargetLevel > ZOOM_OUT_THRESHOLD_FOR_HIDDING_PANELS) {
+    if (thisObject.container.frame.isCenterInViewPort() && canvas.chartingSpace.viewport.zoomTargetLevel > ZOOM_OUT_THRESHOLD_FOR_HIDDING_PANELS) {
       canvas.panelsSpace.unHide(thisObject.payload.node.id, 'Layers Panel')
       canvas.panelsSpace.unHide(thisObject.payload.node.id, 'Plotter Panel')
     } else {
diff --git a/Frame.js b/Frame.js
index 3f8bb1590..f86a0a666 100644
--- a/Frame.js
+++ b/Frame.js
@@ -21,6 +21,7 @@ function newFrame () {
     isThisPointHere: isThisPointHere,   // This function return true is the point received as parameter lives within this frame.
     isThisScreenPointHere: isThisScreenPointHere,
     isInViewPort: isInViewPort,
+    isCenterInViewPort: isCenterInViewPort,
     initialize: initialize,
     finalize: finalize
   }
@@ -76,6 +77,24 @@ function newFrame () {
     }
   }
 
+  function isCenterInViewPort () {
+   /* This function is usefull to know if the object who has this frame is currently appearing at least in part at the canvas.chartingSpace.viewport */
+
+    point = {
+      x: thisObject.width / 2,
+      y: thisObject.height / 2
+    }
+
+     /* Now the transformations. */
+    point = transformThisPoint(point, thisObject.container)
+
+    if (point.x < canvas.chartingSpace.viewport.visibleArea.topRight.x && point.y < canvas.chartingSpace.viewport.visibleArea.bottomRight.y && point.x > canvas.chartingSpace.viewport.visibleArea.bottomLeft.x && point.y > canvas.chartingSpace.viewport.visibleArea.topLeft.y) {
+      return true
+    } else {
+      return false
+    }
+  }
+
   function frameThisPoint (point) {
    /* We need not to modify the point received, so me make a copy of it. */