void TapGestureRecognizer_Tapped (object sender, EventArgs e)
{
BackCard backcard=new BackCard(mCharacter,mRoot, this);
Navigation.InsertPageBefore(backcard,this);
Navigation.PopAsync();
}
void BackButton_Clicked (object sender, EventArgs e)
{
BackCard backcard=new BackCard(mCharacter,root, this);
Navigation.PushAsync(backcard);
Navigation.RemovePage (this);
}
