Problem with lines disappearing when overriding OnPaint event - TreeView - drawing

Question

I have made my own tree view where I am drawing it myself but something weird happens whenever i scroll or select a node on the tree view
Normal view without selecting or scrolling
View when selecting nodes, line disappear
This is the code:
/// <summary>
/// Override draw event
/// </summary>
protected override void OnPaint(PaintEventArgs e)
{
Graphics Gfx = e.Graphics;
Pen Lines = new Pen(Color.LightSlateGray) { DashPattern = new float[] { 5, 2, 15, 4 } };
foreach (TreeNode n in Nodes)
{
DrawNodes(e, n);
if (n.IsExpanded)
{
foreach (TreeNode n2 in n.Nodes)
{
int X, Y, W, H;
X = n2.Bounds.X;
Y = n2.Bounds.Y;
W = n2.Bounds.Width;
H = n2.Bounds.Height;
// Draw lines
if (n2.Index == 0)
{
Gfx.DrawLine(Lines, new Point(X + AutoScrollOffset.X - 5, Y + AutoScrollOffset.Y + (H / 2)),
new Point(X + AutoScrollOffset.X - 5, Y + AutoScrollOffset.Y + H - 2));
Gfx.DrawLine(Lines, new Point(X + AutoScrollOffset.X - 4, Y + AutoScrollOffset.Y + (H / 2)),
new Point(X + AutoScrollOffset.X - 1, Y + AutoScrollOffset.Y + (H / 2)));
// Draw line to root node
Gfx.DrawLine(Lines, new Point(X + AutoScrollOffset.X - 4, Y + AutoScrollOffset.Y + (H / 2)),
new Point(X + AutoScrollOffset.X - 20, Y + AutoScrollOffset.Y));
}
// End child node
if (n2.Index == SelectedNode.Nodes.Count - 1)
{
Gfx.DrawLine(Lines,
X + AutoScrollOffset.X - 5,
Y + AutoScrollOffset.Y + 2,
X + AutoScrollOffset.X - 5,
Y + AutoScrollOffset.Y + (H / 2));
Gfx.DrawLine(Lines,
X + AutoScrollOffset.X - 4,
Y + AutoScrollOffset.Y + (H / 2),
X + AutoScrollOffset.X - 1,
Y + AutoScrollOffset.Y + (H / 2));
}
// Middle child nodes
if (n2.Index > 0 && n2.Index < SelectedNode.Nodes.Count - 1)
{
Gfx.DrawLine(Lines, new Point(X + AutoScrollOffset.X - 5, Y + AutoScrollOffset.Y + 2),
new Point(X + AutoScrollOffset.X - 5, Y + AutoScrollOffset.Y + H - 2));
Gfx.DrawLine(Lines, new Point(X + AutoScrollOffset.X - 4, Y + AutoScrollOffset.Y + (H / 2)),
new Point(X + AutoScrollOffset.X - 1, Y + AutoScrollOffset.Y + (H / 2)));
}
// Draw the nodes
DrawNodes(e, n2);
}
}
}
}
/// <summary>
/// Draw nodes
/// </summary>
private void DrawNodes(PaintEventArgs e, TreeNode CurNode)
{
// Variables
Font TextFont = new Font("Calibri", 9.0f, FontStyle.Regular);
Font RootFont = new Font("Calibri", 10.0f, FontStyle.Bold);
Image EditIcon = Properties.Resources.Updated;
Color Fore = CurNode.ForeColor;
Color Border = Color.Black;
Color Normal = Color.White;
Color Change = Color.LimeGreen;
Rectangle Bounds = CurNode.Bounds;
Rectangle SBounds = CurNode.Bounds;
Graphics Gfx = e.Graphics;
int X, Y, W, H;
// Separate node bounds
X = Bounds.X + 5;
Y = Bounds.Y;
W = Bounds.Width;
H = Bounds.Height;
// Inflate the bounds so it fits
if (CurNode.Level == 0)
{
// Selection bounds
SBounds.Width = (int)Gfx.MeasureString(CurNode.Text, RootFont).Width - 15;
SBounds.Height = (int)Gfx.MeasureString(CurNode.Text, RootFont).Height - 2;
SBounds.X += 15;
SBounds.Y += 2;
}
else
{
// Selection bounds
SBounds.Width = (int)Gfx.MeasureString(CurNode.Text, TextFont).Width - 5;
SBounds.Height = (int)Gfx.MeasureString(CurNode.Text, TextFont).Height - 2;
SBounds.X += 5;
SBounds.Y += 2;
}
// Set renderer to high quality
Gfx.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
// Draw focus rectangles
if (CurNode == CurNode.TreeView.SelectedNode)
{
// Get current forecolor
Fore = SystemColors.HighlightText;
// Draw blue internal rect
Gfx.FillRectangle(new SolidBrush(Color.LightBlue), SBounds);
// Draw focus rectangle
ControlPaint.DrawFocusRectangle(Gfx, SBounds, Fore, Color.LightBlue);
}
else
// Fill nothing
Gfx.FillRectangle(SystemBrushes.Window, SBounds);
// Child level
if (CurNode.Level > 0)
{
// Get measurement data
MobilityMeasurement MeasureToDisplay = MeasurementManager.GetExistingMeasurement(CurNode.Index);
// Draw text
TextRenderer.DrawText(Gfx, CurNode.Text, TextFont, new Point(X, Y), Color.Black);
// Draw icon for change notification
if (MeasureToDisplay.UpdateMethod == MEAS_UPDATE.UPDATE)
Gfx.DrawImage(EditIcon, new Point(X - 15, Y + 2));
}
// Draw root node text
else
{
// Draw the icons
switch (CurNode.Index)
{
case 0:
// Draw the expand sign
if (CurNode.Nodes.Count > 0 && !CurNode.IsExpanded)
Gfx.DrawImage(Properties.Resources.Expand, new Point(X - 2, Y + (H/2) - (Properties.Resources.Expand.Height/2) + 1));
else if (CurNode.Nodes.Count > 0 && CurNode.IsExpanded)
Gfx.DrawImage(Properties.Resources.DeExpand, new Point(X - 2, Y + (H/2) - (Properties.Resources.Expand.Height/2) + 1));
Gfx.DrawImage(Properties.Resources.ExistingMeas, new Point(X - 20, Y + 2));
break;
case 1:
Gfx.DrawImage(Properties.Resources.NewMeas, new Point(X - 20, Y + 2));
break;
}
// Draw root text
TextRenderer.DrawText(Gfx, CurNode.Text, RootFont, new Point(X + 10, Y + 2), Color.Black);
// Draw lines
//Gfx.DrawLine(new Pen(Color.Red), new Point(X - 5,Y + W), new Point(X - 5,Y + W + 10));
}
}
Does anyone have any suggestions on how i can fix this?
Thank you in advance
-Rowdy