The function InitMainMenu has been implemented this inside the pdfviewer class. It first request the count of action "kinds". Each action kind should create one menu caption with a drop down menu. Inside the dropdown menu there are the action "operations". Certain flags are used to hide a submenu or to make a submenu caption item for a deeper drop down menu.

public void InitMainMenu(System.Windows.Forms.MenuStrip menuStrip,

  System.EventHandler OnClick ,

  System.Windows.Forms.ToolStripMenuItem FileMenu ,

  System.Windows.Forms.ToolStripMenuItem InfoMenu      

  )

{

    int kmax = Command( commands.COMPDF_ACTION_READ, "kinds", 0);

    bool isPlus = (Command(commands.COMPDF_GetWPViewPDFPLUSFlag) != 0);

    for(int k = 0; k<kmax; k++)

    {

System.Windows.Forms.ToolStripMenuItem men;

System.Windows.Forms.ToolStripMenuItem asubmenu = null;

int mencount = 0;

bool reverse = true;

// -------------------------------------------------------------------------------

if ((k == 0) && (FileMenu != null))

    men = FileMenu;

else if ((k == kmax - 1) && (InfoMenu != null))

{

    men = InfoMenu;

    reverse = false;

}

else

{

    men = new System.Windows.Forms.ToolStripMenuItem();

    men.Text = CommandGetStr(commands.COMPDF_ACTION_READ, "kcaption", k);

}

// -------------------------------------------------------------------------------

int omax = Command(commands.COMPDF_ACTION_READ, "operation", k);

for(int o = omax-1; o>=0; o--)

{

  int ac = (k << 16) + o;

  string s = CommandGetStr(commands.COMPDF_ACTION_READ, "caption", ac);

  int flags =  Command(commands.COMPDF_ACTION_READFLAGS, ac );

    /*  flags:

  wpNeedSeperator,  // 1: add an seperator after the menu

  wpNoMenuItem,     // 2: Dont create menu items

  wpIsPlusAction,   // 4: Requires WPViewPDF PLUS

  wpRequireWriting,  // 8: Requires the PDF to be not protected

  wpGlobalOperation, // 16: This action doe not require PDF to be loaded

  wpMakeSubmenu      // 32: The following items until  wpNeedSeperator should be sub menus of this

    */

  if ((s!="") && ((flags & 32)!=0))

   {

asubmenu = new System.Windows.Forms.ToolStripMenuItem();  

asubmenu.Text = s;

men.DropDownItems.Add(asubmenu);

   }

  else

  if ((s!="") && (isPlus || ((flags & 4)==0))  && ((flags & 2)==0))

   {

System.Windows.Forms.ToolStripMenuItem submen;

submen = new System.Windows.Forms.ToolStripMenuItem();

submen.Text = s;

submen.ToolTipText =  CommandGetStr(commands.COMPDF_ACTION_READ, "hint", ac) ;

submen.Tag = ac;

submen.Click += new System.EventHandler(OnClick);

if (asubmenu != null)

    asubmenu.DropDownItems.Add(submen);

else

{

    if(reverse)men.DropDownItems.Insert(0, submen);

    else men.DropDownItems.Add(submen);

}

if ((flags & 1)!=0)

  asubmenu = null;

mencount++;

   }

}

if (mencount>0)

{

    menuStrip.Items.Add(men);

}

else men = null;

    }

}