You do nott see this special menu in the 2.0 code base.
In 1615, I was able to get the default menu by handling the CurrentCellControlGotFocus, and setting the ContextMenu null there so the default menu would be used.
private void gridControl1_CurrentCellControlGotFocus(object sender, ControlEventArgs e)
{
if(e.Control.ContextMenu != null && e.Control is GridMaskedEditBox)
e.Control.ContextMenu = null;
}