private void button1_Clicked(object sender, EventArgs e)
{
if (button1.Text == "alpha")
{
button1.Text = "omega";
button1.IconUri = new Uri("/Assets/AppBar/omega.png", UriKind.Relative);
}
else
{
button1.Text = "alpha";
button1.IconUri = new Uri("/Assets/AppBar/alpha.png", UriKind.Relative);
}
}