Sorry for the delay in sending this.

I created a simple Crosslight (Android) project which emulate the Email validator behavior. Following steps shows the detail:

1. open Visual Studio and select New, Project.
2. From the dialog that appears, choose Visual C#, Intersoft Solutions, Mobile, then select Intersoft Crosslight Application (iOS, Android, Windows). Enter other necessary information such as Name, Location and Solution Name.
   
3. Create a Crosslight Blank solution, by choosing Blank from the drop down and hit OK.
   
4. Once the project is created, open SimpleViewModel.cs located inside the [Project Name].Core project.
5. Locate NewText property inside the SimpleViewModel class and replace the entire code as follows:
   

   public string NewText
   {
       get { return _newText; }
       set
       {
           if (_newText != value)
           {
               _newText = value;
   
               const string emailRegex = @"^(?("")("".+?(?<!\\)""@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&'\*\+/=\?\^`\{\}\|~\w])*)(?<=[0-9a-z])@))" +
                   @"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-\w]*[0-9a-z]*\.)+[a-z0-9][\-a-z0-9]{0,22}[a-z0-9]))$";
   
               var IsValid = (Regex.IsMatch(_newText, emailRegex, RegexOptions.IgnoreCase, TimeSpan.FromMilliseconds(250)));
   
               if (IsValid)
                   GreetingText = "Your email looks good";
               else
                   GreetingText = "Enter a valid email";
   
               OnPropertyChanged("NewText");
           }
       }
   }

   
   In the setter of NewText, email validation is added. The email validation uses emailRegex string constant and IsMatch method. When IsValid expression returns true, GreetingText property will be set to "Your email looks good". Else, it will be set set to "Enter a valid email".
6. Add a folder in the [Project Name].Core project and named it as Converters.
7. Add a class and named it as TextStyleConverter.cs into the Converters folder.
8. Copy and replace the entire code of TextStyleConverter class as follows:
   

   using Intersoft.Crosslight;
   using Intersoft.Crosslight.Drawing;
   using System;
   using System.Globalization;
   
   namespace EmailValidator.Converters
   {
       public class TextStyleConverter : IValueConverter
       {
           #region IValueConverter implementation
   
           public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
           {
               if (value != null)
               {
                   var styles = new StyleAttributes();
   
                   if (value.ToString() == "Your email looks good")
                       styles.ForegroundColor = Colors.Green;
                   else
                       styles.ForegroundColor = Colors.Red;
   
                   return styles;
               }
               return value;
           }
   
           public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
           {
               throw new NotSupportedException();
           }
   
           #endregion
       }
   }

   
   This converter sets ForegroundColor to green when email is valid and sets ForegroundColor to red when email is not valid.
9. Open SimpleBindingProvider.cs located inside the [ProjectName].Core project.
10. Add following snippet code into the constructor of SimpleBindingProvider class.
    

    this.AddBinding("GreetingLabel", BindableProperties.StyleAttributesProperty, new BindingDescription("GreetingText")
    {
        Converter = new TextStyleConverter()
    });

    
    The code adds a binding provider which acts as the mediator that provides binding definitions to the interested parties such as view models and views. The GreetingLabel is the view target contract; the BindableProperties.StyleAttributesProperty is the target property to bind; and the rest is the binding description to the converter.
11. Save the changes and run the project.

I enclosed the simple Android project (as attachment) for your reference. Hope this helps.

Right now we have a license for the WebGrid Version 9.0.7200.1.
Do we need to purchase another license for WebGrid 10 and latest WebUI.NET Framework 3.0 or it is free.

With your current license, you should be able to get hotfix of WebUI.NET Framework 3.0. You will not be able to get hotfix of WebGrid 10 since you don't own a license of WebGrid 10.

Also can You please let us know the detailed process of upgrading the controls.

The Updating WebUI Studio page in here contains detail information (including video tutorial) which shows how you can use the Update Manager to update Intersoft Products.

Please feel free to let me know if you are having difficulties to obtain and apply hotfix using Intersoft Update Manager application. I will assist you further with the manual way.

The reported problem(s) aren't reproducible using WebGrid 10 and latest WebUI.NET Framework 3.0. You might want to check out the live sample of WebGrid on Chrome browser.

I recommend you to try to update WebUI.NET Framework 3.0. The most recent version of WebUI.NET Framework 3.0 is 3.0.5000.975. Please use Intersoft Update Manager application to download and install the hotfix of WebUI.NET Framework 3.0.

Please let me know whether this helps or not.

Crosslight setup file will install the visual studio wizard in the following location: "C:\Documents and Settings\<UserName>\Documents\<Visual Studio version>\Templates\ProjectTemplates\Visual C#\Intersoft Solutions\Mobile".
Please kindly check if following files are found inside the folder:

• CrosslightApp.zip (Crosslight project template)
• CrosslightDomainModels.zip (Domain model template)

I was able to reproduce the reported problem in my local end.

The problem happen because IsEditing in ViewModel doesn't change to true when the view changed into edit mode. I got the expected result if modify my command (in the ViewModel) into the following:

public void ExecuteCustomCmd(object parameter)
{
    this.IsEditing = true;
    
    // do something in here
    //this.ToastPresenter.Show("hello world");
    
    this.IsEditing = false;
}

This problem is no longer persist in the experimental assembly of Crosslight. If it's okay for you, you can try to use my approach as workaround.

Hope this helps.