VitNX_ToolWindow.OnMouseMove Method

protected override void OnMouseMove(MouseEventArgs e)
 {
     base.OnMouseMove(e);
     if (_closeButtonRect.Contains(e.Location) || _closeButtonPressed)
     {
         if (!_closeButtonHot)
         {
             _closeButtonHot = true;
             Invalidate();
         }
     }
     else
     {
         if (_closeButtonHot)
         {
             _closeButtonHot = false;
             Invalidate();
         }
         if (_shouldDrag)
         {
             DockPanel.DragContent(this);
             return;
         }
     }
 }