Rectangular Select

Hi, I have troubles with rectangular selection. I implemeted selection from intermediate tutorial 4 (http://www.ogre3d.org/addonforums/viewtopic.php?f=8&t=14199) and selection working fine, but nothing is visible. No rectangle, no line. Objects are selected but with invisible SelectionRectangle. Any idea how to fix it?

Here is my code:
public bool OnMyMousePressed(MouseEvent evt, MouseButtonID id) {
if (id == MouseButtonID.MB_Left) {
using (Mogre.RaySceneQuery raySceneQuery = sceneMgr.CreateRayQuery(new Mogre.Ray())) {
float mouseX = (float)evt.state.X.abs / (float)evt.state.width;
float mouseY = (float)evt.state.Y.abs / (float)evt.state.height;

Mogre.Ray mouseRay = cameraMan.getCamera().GetCameraToViewportRay(mouseX, mouseY);
raySceneQuery.Ray = mouseRay;
raySceneQuery.SetSortByDistance(true);

using (Mogre.RaySceneQueryResult result = raySceneQuery.Execute()) {
foreach (Mogre.RaySceneQueryResultEntry entry in result) {
if (entry.movable.Name != "GroundEntity") {
groupManager.selectGroup(entry.movable);
}
}
}
}

} else {
if (id == MouseButtonID.MB_Right) {
groupManager.changeSolarSystem(changeMe);
guiControl.setSolarSystemName(groupManager.getSolarSystemName(changeMe));
changeMe = (changeMe + 1) % 2;
} else {
if (id == MouseButtonID.MB_Middle) {
//rectangular select
mStart.x = (float)evt.state.X.abs / (float)evt.state.width;
mStart.y = (float)evt.state.Y.abs / (float)evt.state.height;
mStop = mStart;

bSelecting = true;
mRect.Clear();
mRect.Visible = true;

Console.WriteLine(evt.state.X.abs + ", " + evt.state.Y.abs);
}
}
}
return true;
}

/// <summary>
/// This special function is called when any mouse button is released
/// </summary>
/// <param name="arg">argument of release</param>
/// <param name="id">which button was released</param>
/// <returns>was released true</returns>
public bool OnMyMouseReleased(MouseEvent arg, MouseButtonID id) {
switch (id) {
case MOIS.MouseButtonID.MB_Middle:
performSelection(mStart, mStop);
bSelecting = false;
mRect.Visible = false;
break;
}
return true;
}


public bool OnMyMouseMoved(MouseEvent evt) {
if (bSelecting) {
mStop.x = evt.state.X.abs / (float)evt.state.width;
mStop.y = evt.state.Y.abs / (float)evt.state.height;

Console.WriteLine( evt.state.X.abs + ", " + evt.state.Y.abs );

mRect.setCorners(mStart, mStop);
}
return true;
}


private void performSelection(Vector2 first, Vector2 second) {
deselectObjects(); //delete
float left = first.x, right = second.x,
top = first.y, bottom = second.y;

if (left > right) swap(ref left, ref right);
if (top > bottom) swap(ref top, ref bottom);

if ((right - left) * (bottom - top) < 0.0001) return;

Camera c = sceneMgr.GetCamera("myCam");
Ray topLeft = c.GetCameraToViewportRay(left, top);
Ray topRight = c.GetCameraToViewportRay(right, top);
Ray bottomLeft = c.GetCameraToViewportRay(left, bottom);
Ray bottomRight = c.GetCameraToViewportRay(right, bottom);

PlaneBoundedVolume vol = new PlaneBoundedVolume();
vol.planes.Add(new Plane(topLeft.GetPoint(3), topRight.GetPoint(3), bottomRight.GetPoint(3))); // front plane
vol.planes.Add(new Plane(topLeft.Origin, topLeft.GetPoint(100), topRight.GetPoint(100))); // top plane
vol.planes.Add(new Plane(topLeft.Origin, bottomLeft.GetPoint(100), topLeft.GetPoint(100))); // left plane
vol.planes.Add(new Plane(bottomLeft.Origin, bottomRight.GetPoint(100), bottomLeft.GetPoint(100)));// bottom plane
vol.planes.Add(new Plane(topRight.Origin, topRight.GetPoint(100), bottomRight.GetPoint(100))); // right plane

PlaneBoundedVolumeList volList = new PlaneBoundedVolumeList();
volList.Add(vol);
PlaneBoundedVolumeListSceneQuery volQuery = sceneMgr.CreatePlaneBoundedVolumeQuery(volList);
SceneQueryResult result = volQuery.Execute();

foreach (var obj in result.movables) {
selectObject(obj);
}

sceneMgr.DestroyQuery(volQuery);
}

void selectObject(MovableObject obj) {
obj.ParentSceneNode.ShowBoundingBox = true;
mSelected.Add(obj);
}

void deselectObjects() {
foreach (var obj in mSelected) {
obj.ParentSceneNode.ShowBoundingBox = false;
Console.WriteLine(obj.Name);
}
mSelected.Clear();
}



//static method tests

static void swap(ref float x, ref float y) {
float tmp = x;
x = y;
y = tmp;
}
public class SelectionRectangle : ManualObject {
public SelectionRectangle(String name)
: base(name) {
RenderQueueGroup = (byte)RenderQueueGroupID.RENDER_QUEUE_OVERLAY; // when using this, ensure Depth Check is Off in the material
UseIdentityProjection = true;
UseIdentityView = true;
QueryFlags = 0;
}

/**
* Sets the corners of the SelectionRectangle. Every parameter should be in the
* range [0, 1] representing a percentage of the screen the SelectionRectangle
* should take up.
*/
void setCorners(float left, float top, float right, float bottom) {
left = left * 2 - 1;
right = right * 2 - 1;
top = 1 - top * 2;
bottom = 1 - bottom * 2;
Clear();
Begin("", RenderOperation.OperationTypes.OT_LINE_STRIP);
Position(left, top, -1);
Position(right, top, -1);
Position(right, bottom, -1);
Position(left, bottom, -1);
Position(left, top, -1);
End();
BoundingBox.SetInfinite();
}

public void setCorners(Vector2 topLeft, Vector2 bottomRight) {

setCorners(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
}
}


Solved. Line was missing.
sceneMgr.RootSceneNode.CreateChildSceneNode().AttachObject(mRect);