TAB

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (keyData == Keys.Enter && ((!(ActiveControl is System.Windows.Forms.TextBox) || !((System.Windows.Forms.TextBox)ActiveControl).AcceptsReturn)))
{
SendKeys.SendWait("{Tab}");
return true;
}
if (keyData == (Keys.Enter | Keys.Shift))
{
SendKeys.SendWait("+{Tab}");
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}