ARCed.UI.DockPanel.DragHandlerBase.BeginDrag C# (CSharp) Method

            protected bool BeginDrag()
            {
                // Avoid re-entrance;
                lock (this)
                {
                    if (this.DragControl == null)
                        return false;

                    this.StartMousePosition = MousePosition;

                    if (!NativeMethods.DragDetect(this.DragControl.Handle, this.StartMousePosition))
                        return false;

                    this.DragControl.FindForm().Capture = true;
                    AssignHandle(this.DragControl.FindForm().Handle);
                    Application.AddMessageFilter(this);
                    return true;
                }
            }