Hello Richard,

Thank you for the additional details.

When the XamPropertyGrid.SelectedObjects property is set and custom EditTemplate is bound to the Value property, the XamPropertyGrid will use the first element in the array to display it in the PropertyGridPropertyItemView. In the attached sample project that will be David.

The default behavior could be changed by binding the custom editor to the SelectedObject:

<ig:PropertyGridEditorDefinition >
                    <ig:PropertyGridEditorDefinition.TargetProperties>
                        <sys:String>FirstName</sys:String>
                    </ig:PropertyGridEditorDefinition.TargetProperties>
                    <ig:PropertyGridEditorDefinition.EditTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ig:XamPropertyGrid}}, Path=SelectedObjects, Converter={StaticResource conv}}"/>
                        </DataTemplate>
                    </ig:PropertyGridEditorDefinition.EditTemplate>
                </ig:PropertyGridEditorDefinition>

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            object[] items = value as object[];
            string firstName = (items[0] as ClientViewModel).FirstName;
            if(items != null)
            {
                foreach (var item in items)
                {
                    if ((item as ClientViewModel).FirstName != firstName)
                        return "";
                }
            }
            
                return firstName;
        }

Hi Maria, thanks for your reply but that's not really what I'm asking. I was just giving an example of a check box recognizing multiple values and being set as indeterminate. Another example would be a text box bound to a string property where the objects in the SelectedObjects collection have different values. The behavior of the text box control is to show a blank value. That is what I'm after. How are these controls aware that there are multiple values?