Context menu handlers not being called

I have created a contect menu with message handlers in a modeless dialog which gets called from a DLL not the main app. Although the menu comes up on a right click the menu items for wich I have provided handlers are greyed out. All other messages are processed correctly. Normally this occurs when the windows messages do not make it to the dialog box. I don't know how to make sure they route to the dialog and where they are being eaten.
Does any one know how to stop this from happening or where to ensure the routing takes place?

BEGIN_MESSAGE_MAP(CEHRPropertyPage1, CPropertyPage)
      ON_WM_CONTEXTMENU()
      //{{AFX_MSG_MAP(CEHRPropertyPage1)
      ON_NOTIFY(NM_CLICK, IDC_TREE_DECISION_TREE, OnClickTreeDecisionTree)
      ON_NOTIFY(NM_DBLCLK, IDC_TREE_DECISION_TREE, OnDblclkTreeDecisionTree)
      ON_BN_CLICKED(IDC_BUTTON_EDIT_TREE, OnButtonEditTree)
      ON_COMMAND(ID_POPUP_ADDSUBTREE, OnPopupAddSubTree)
      ON_UPDATE_COMMAND_UI(ID_POPUP_ADDSUBTREE, OnUpdatePopupAddsubtree)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()

void CEHRPropertyPage1::OnContextMenu(CWnd*, CPoint point)
{

      // CG: This block was added by the Pop-up Menu component
      {
            if (point.x == -1 && point.y == -1){
                  //keystroke invocation
                  CRect rect;
                  GetClientRect(rect);
                  ClientToScreen(rect);

                  point = rect.TopLeft();
                  point.Offset(5, 5);
            }

            CMenu menu;
            VERIFY(menu.LoadMenu(CG_IDR_POPUP_EHRPROPERTY_PAGE1));

            CMenu* pPopup = menu.GetSubMenu(0);
            ASSERT(pPopup != NULL);
            CWnd* pWndPopupOwner = this;

            while (pWndPopupOwner->GetStyle() & WS_CHILD)
                  pWndPopupOwner = pWndPopupOwner->GetParent();

            pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y,
                  pWndPopupOwner);
      }
}

void CEHRPropertyPage1::OnPopupAddSubTree()
{
      OnButtonEditTree();
}

void CEHRPropertyPage1::OnUpdatePopupAddsubtree(CCmdUI* pCmdUI)
{
       pCmdUI->Enable();

}