For the fist question, the easiest way is to add a "fake" property computed from the "real" property. It's not perfect, but you can use various attribute to help:

• DisplayName to give the fake property the name of the real property
• Browsable(false) instructs the property grid to skip the real property

• EditorBrowsable(never) instructs Visual Studio's intellisense to not show this property in external code.

      [Browsable(false)]
      public ParameterObject[] Parameters
      {
          get { return _parameters; }
          set { _parameters = value; }
      }
  
      [Category("SubReportParams"), DisplayName("Parameters")]
      [EditorBrowsable(EditorBrowsableState.Never)]
      public ParameterObject[] NonEmptyParameters
      {
          get
          {
              return _parameters.Where(p => p != null).ToArray();
          }
      }
  

For the second question, one simple way is to add a ToString() implementation like this:

public class ParameterObject
{
    public override string ToString()
    {
        return Name;
    }
}

Otherwise, you can to add a custom TypeConverter to the class.