public void Navigate()
{
var evt = new NeedToChangeContentEventArg("AdvancedView");
ChangeContentEvent(this, evt);
}
private void ChangeContentEvent(object o, NeedToChangeContentEventArg e)
{
if (NeedToChangeContent != null)
NeedToChangeContent(o, e);
}
public void GoBack()
{
var evt = new NeedToChangeContentEventArg("SimpleView");
ChangeContentEvent(this, evt);
}