private void MManagerOnActiveContentChanged(object _sender, EventArgs _eventArgs)
{
PropertyChanged.Cast(this, () => ActivePage);
PropertyChanged.Cast(this, () => ForwardCommand);
PropertyChanged.Cast(this, () => BackCommand);
PropertyChanged.Cast(this, () => CloseCommand);
PropertyChanged.Cast(this, () => RevertCommand);
PropertyChanged.Cast(this, () => UndoCommand);
PropertyChanged.Cast(this, () => RedoCommand);
PropertyChanged.Cast(this, () => SaveCommand);
if (ActivePage != null)
{
ActivePage.Selected();
}
}