How to add ComboBox to PropertyGrid

Create new class which inherit StringCoverter, and 3 methods:

internal class List2PropertyConverter : StringConverter
    {
        public override bool
            GetStandardValuesSupported(
            ITypeDescriptorContext context)
        {
            //True - means show a Combobox
            //and False for show a Modal 
            return true;
        }

        public override bool
            GetStandardValuesExclusive(
            ITypeDescriptorContext context)
        {
            //False - a option to edit values 
            //and True - set values to state readonly
            return true;
        }

        public override StandardValuesCollection
            GetStandardValues(
            ITypeDescriptorContext context)
        {
            return new StandardValuesCollection(
                new string[] {"test1", "test2", "..."});
        }
    }

Add variable and encapsulate it:

 private string testValue;
        [Browsable(true)]
        [Category("Category name")]
        [TypeConverter(typeof(List2PropertyConverter))]
        public string TestValues
        {
            get { return testValue; }
            set { testValue = value; }
        }

PropertyGrid has 4 attributes for a manage properties:

[Browsable(bool)] - Visible/Hide property

[ReadOnly(bool)] - Editing (true/false)

[Category(string)] - Group of properties

[Description(string)] - Description of the property

Regards,