needed to be added instead of using Ctrl+Left_Mouse_Click
void cbStyledTextCtrl::SelectWord()
{
   const int nPos = GetCurrentPos();
   int nPos_Start = WordStartPosition(nPos, true);
   int nPos_End = WordEndPosition(nPos, true);
   wxScintilla::SetEmptySelection(nPos);
   if((nPos == nPos_Start) || (nPos == nPos_End))
   {
      return;
   }
   wxScintilla::SetSelectionStart(nPos_Start);
   wxScintilla::SetSelectionEnd(nPos_End);
}
//
//main.cpp
int idEditSelectWord = XRCID("idEditSelectWord");
...
EVT_MENU(idEditSelectWord, MainFrame::OnEditSelectWord)
..
void MainFrame::OnEditSelectWord(wxCommandEvent& /*event*/)
{
   if(cbEditor* p_cbEditor = Manager::Get()->GetEditorManager()->GetBuiltinActiveEditor())
   {
      p_cbEditor->GetControl()->SelectWord();
   }
}
//main_menu.xrc
      <object class="wxMenuItem" name="idEditSelectWord">
        <label>Select Word</label>
        <accel>Ctrl-P</accel>
        <help>Selects word under keyboard cursor</help>
      </object>
/// paste word
void cbStyledTextCtrl::PasteWord()
{
   if(true == GetSelectedText().IsEmpty())
   {
      SelectWord();
   }
   Paste();
}