ComboBox in PropertyGrid is empty

[Isabel]

I've created a small application with a View and ViewModel.

In the view a PropertyGrid is used it  edit the properties from the ViewModel based on data annotations.

The ViewModel contains two properties:
    “SelectedBrand”            - the currently selected brand
    “Brands”                        - a list of all available brands.

The PropertyGrid should provide a ComboBox to edit the “SelectedBrand” and should hide the “Brands”.

So I’ve annotated “Brands”  with a “Browsable(false)” and “SelectedBrand” with a “Editor(typeof(RadComboBox))” attribute.

This works so far quite well.

Now here’s the catch: How do I tell the editor, that the “Brands” should be used as ItemsSource for  the ComboBox ?

Right now the combo box is just empty.

Thanksin advance

[Isabel]

ViewModel:

private string _selectedType;
        /// <summary>Gets or sets the type of the selected.</summary>
        /// <value>The type of the selected.</value>
        //[Attribute("Types")
        [Telerik.Windows.Controls.Data.PropertyGrid.Editor(typeof(RadComboBox))]
        public string SelectedType
        {
            get
            {
                return this._selectedType;
            }
            set
            {
                this._selectedType = value;
                this.OnPropertyChanged(() => this.SelectedType);
            }
        }
        /// <summary>Gets or sets the types.</summary>
        /// <value>The types.</value>
        [Browsable(false)]
        public IEnumerable<string> Types
        {
            get
            {
                yield return "AUDI";
                yield return "BMW";
                yield return "VW";
            }
        }

View:

<StackPanel>
        <TextBlock Text="SelectedTypes:"/>
        <TextBlock Margin="5,2" Text="{Binding SelectedType, TargetNullValue='--'}" />
        <TextBlock Text="Types:" FontWeight="Bold"/>
        <ItemsControl ItemsSource="{Binding Types}"></ItemsControl>
    </StackPanel>

[Stefan]

Hi Isabel,

I recommend you to acquaint yourself more about the MVVM pattern. You can check out this and this article on this topic. In short, it's not correct your ViewModel to have presentation logic, like in your case.

I would also advise you to read our documentation on the Editor Attribute. It's main purpose is to set it on the properties of your business models.

As for your question, it won't be felicitous to use the Editor Attribute for ComboBox control, as there is no way to handle the SelectedItem property with it.

Best Regards,

Stefan

Telerik