New Post: Property Grid with ComboBox

Hi,

I am trying to implement an editable combobox inside of my propertygrid and I am stuck on a couple of issues. I have the following XAML code to make the combobox editable:

<xctk:PropertyGrid x:Name="PropertyGrid" Width="450"  Margin="10">   
            <xctk:PropertyGrid.EditorDefinitions>
                <xctk:EditorDefinition>
                    <xctk:EditorDefinition.PropertiesDefinitions>
                        <xctk:PropertyDefinition Name="MyValues"/>
                    </xctk:EditorDefinition.PropertiesDefinitions>
                    <xctk:EditorDefinition.EditorTemplate>
                        <DataTemplate>
                            <ComboBox ItemsSource="{Binding Value}" IsEditable="True"/>
                        </DataTemplate>
                    </xctk:EditorDefinition.EditorTemplate>
                </xctk:EditorDefinition>
            </xctk:PropertyGrid.EditorDefinitions>
        </xctk:PropertyGrid>

As far as I know, this XAML will look for a property named "MyValues" and give it an editable combobox in the propertygrid. This seems to work fine until I set the ItemsSource attribute on the MyValues property. Setting the ItemsSource attribute seems to overwrite my editable combobox and it instead replaces it with the default combobox.

For my next issue, I have the following C# code that the property "MyValues" uses for it's item source:

    public class MyValuesItemsSource : IItemsSource
    {
        public Xceed.Wpf.Toolkit.PropertyGrid.Attributes.ItemCollection GetValues()
        {
            Xceed.Wpf.Toolkit.PropertyGrid.Attributes.ItemCollection values = new Xceed.Wpf.Toolkit.PropertyGrid.Attributes.ItemCollection();
            values.Add("one");
            values.Add("two");
            return values;
        }
    }

This seems to also work fine, but how do I add to this ItemsSource at run time? Say something happens during the course of the program and I want to add another option to the combobox (perhaps "three"), or I want to remove one of the options, how is this done?

Thank you for the help!