//Start dragging if mouse was moved
private void StartDragging(object sender, MouseEventArgs e)
{
Point movePoint = this.OwnerNode.OwnerCTreeView.PointToClient(Cursor.Position);
if (Math.Abs(mouseDownPosition.X - movePoint.X) + Math.Abs(mouseDownPosition.Y - movePoint.Y) > 5)
//if (Math.Abs(mouseDownPosition.X - e.Location.X) + Math.Abs(mouseDownPosition.Y - e.Location.Y)>5)
{
this.MouseUp -= NotDragging;
this.MouseMove -= StartDragging;
OwnerNode.Drag();
}
}