使用回车代替Tab键

protected override bool ProcessCmdKey(ref Message msg,Keys keyData)
  {
   if ( keyData==Keys.Right || keyData==Keys.Down || keyData==Keys.Enter)
   {
    if(keyData == Keys.Enter)
    {
     System.Windows.Forms.SendKeys.Send("{TAB}");
     return true;
    }
    if(keyData==Keys.Down )
    {
     System.Windows.Forms.SendKeys.Send("{TAB}");
     return true;
    }    
    if(keyData==Keys.Right )
    {
     System.Windows.Forms.SendKeys.Send("{TAB}");
     return true;
    }    
   }
   
   return base.ProcessCmdKey(ref msg,keyData);   
  }