void Handle_Clicked(object sender, System.EventArgs e)
 {
     Syncfusion.XForms.Buttons.SfButton button = (sender as Syncfusion.XForms.Buttons.SfButton);
     if (button == centerAlignButton)
     {
         textStack.HorizontalOptions         = LayoutOptions.Center;
         hellowWorld.HorizontalTextAlignment = TextAlignment.Center;
         centerAlignButton.BackgroundColor   = Color.LightGray;
         leftAlignButton.BackgroundColor     = Color.Transparent;
         rightAlignButton.BackgroundColor    = Color.Transparent;
     }
     else if (button == leftAlignButton)
     {
         textStack.HorizontalOptions         = LayoutOptions.Start;
         hellowWorld.HorizontalTextAlignment = TextAlignment.Start;
         centerAlignButton.BackgroundColor   = Color.Transparent;
         leftAlignButton.BackgroundColor     = Color.LightGray;
         rightAlignButton.BackgroundColor    = Color.Transparent;
     }
     else if (button == rightAlignButton)
     {
         textStack.HorizontalOptions         = LayoutOptions.End;
         hellowWorld.HorizontalTextAlignment = TextAlignment.End;
         centerAlignButton.BackgroundColor   = Color.Transparent;
         leftAlignButton.BackgroundColor     = Color.Transparent;
         rightAlignButton.BackgroundColor    = Color.LightGray;
     }
 }
 private void FontButton_Clicked(object sender, System.EventArgs e)
 {
     Syncfusion.XForms.Buttons.SfButton button = (sender as Syncfusion.XForms.Buttons.SfButton);
     if (button == boldButton || button == italicButton)
     {
         if (boldButton.IsChecked && italicButton.IsChecked)
         {
             hellowWorld.FontAttributes = FontAttributes.Bold | FontAttributes.Italic;
         }
         else if (boldButton.IsChecked)
         {
             hellowWorld.FontAttributes = FontAttributes.Bold;
         }
         else if (italicButton.IsChecked)
         {
             hellowWorld.FontAttributes = FontAttributes.Italic;
         }
         else
         {
             hellowWorld.FontAttributes = FontAttributes.None;
         }
     }
     else if (button == underlineButton)
     {
         underlineBoxView.IsVisible = underlineButton.IsChecked;
     }
 }