Thanks for pointing me to right direction, infact one can create quite complex editors. 

Hi Ajit

You're welcome - Yes it's actually only the creativity (and skills) that sets the limit. I just created a property editor that gives me some data that I manage from a custom section. It's really nice to be able to have this kind of flexibility :)

Happy coding!

/Jan

Old thread but a solution I use is to prefix an alias 'mc_' (mandatory component) to a list of property types and do a check on saving action to see if a value is available in either of those properties.

This allows me to add as many mandatory properties without creating custom property types.

Code below :

    public class MandatoryComponents : ApplicationEventHandler
{
    /// <summary>
    /// alias prefix to check against
    /// </summary>
    private const string ALIAS_PREFIX = "mc_";


    protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        ContentService.Saving += MandatoryCheck;
    }

    /// <summary>
    /// Check each property type on a component we are saving for the prefix alias
    /// if at least one has a value continue.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void MandatoryCheck(IContentService sender, SaveEventArgs<IContent> e)
    {
        var mandatoryPropertyList = new List<Property>();

        foreach(var entity in e.SavedEntities)
        {
            foreach(var prop in entity.Properties)
            {
                if(prop.Alias.StartsWith(ALIAS_PREFIX))
                {
                    mandatoryPropertyList.Add(prop);
                }
            }
        }

        if(mandatoryPropertyList.Count < 2)
        {
            return;
        }
        else
        {
            if(mandatoryPropertyList.Any(x => x.Value != null))
            {
                return;
            }
            else
            {
                var properties = string.Join(", ", mandatoryPropertyList.Select(x => x.PropertyType.Name).ToArray());
                e.Cancel = true;
                e.Messages.Add(new EventMessage("Oops!",
                    "Please add a value to either " + properties, EventMessageType.Error));
            }
        }          
    }
}

Understand this is an older thread but this may be useful.

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