MenuStrip style

Hello, in the attached code I creating a style for menustrip. For example when hover a root menu item looks like pressed. The problem is that I want to keep it pressed while it's dropdown opened but for a reason attached code not working. If I put a messagebox when a dropdown child selected it working (keeps style of the root item). So seems possible need right management of application events. Or...?

Appriciate in advance any ideas.     

public class NextInnovationsToolStripRenderer : ToolStripRenderer
      {
          private bool IsChildSelected(ToolStripMenuItem toolStripItem)
          {
              for (int i = 0; i < toolStripItem.DropDownItems.Count; i++)
              {                 
                  if (toolStripItem.DropDownItems[i].Selected)
                  {                     
                      return true;
                  }
                  else return IsChildSelected((ToolStripMenuItem)toolStripItem.DropDownItems[i]);
              }
            
              return false;            
          }        

          protected override void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e)
           
          {             
              //base.OnRenderItemBackground(e);
            
              Rectangle rc = new Rectangle(Point.Empty, e.Item.Size);
              if (!e.Item.IsOnDropDown )
              {
                  if (e.Item.Selected || IsChildSelected((ToolStripMenuItem)e.Item))
                  {                    
                      base.OnRenderItemBackground(e);
                      e.Graphics.DrawLine(Pens.DarkGray, 1, 0, rc.Width - 1, 0);
                      e.Graphics.DrawLine(Pens.DarkGray, 1, 0, 1, rc.Height - 1);
                      e.Graphics.DrawLine(Pens.Wheat, rc.Width - 1, 0, rc.Width - 1, rc.Height - 1);
                      e.Graphics.DrawLine(Pens.Wheat, 1, rc.Height - 1, rc.Width - 1, rc.Height - 1);                     
                  }
                 
              }
              else if (e.Item.IsOnDropDown & e.Item.Selected)
              {                 
                  e.Graphics.FillRectangle(Brushes.DarkBlue, rc);
                  e.Item.ForeColor = Color.White;                 
              }

              if (e.Item.IsOnDropDown & !e.Item.Selected)
              {
                  e.Item.ForeColor = Color.Black;                
              }

              Application.DoEvents();
             
          }    

          protected override void OnRenderToolStripBorder(ToolStripRenderEventArgs e)
          {
              base.OnRenderToolStripBorder(e);
              ControlPaint.DrawFocusRectangle(
                  e.Graphics,
                  e.AffectedBounds,
                  SystemColors.ControlDarkDark,
                  SystemColors.ControlDarkDark);
          }

        
      }

Alexander Israel