Refresh problem for combobox

Question

I have a combox box which is bind with dependencyproperty My itemsource is bind to arraylist of string and the selectedValue to a string

I want to modify the combobox context by code The first one is it OK but as i click in my comboxbox and after i want to change her contains it doesn' work

My xmal

<ComboBox Name="ComboCateg3" SelectionChanged="Filter_SelectionChanged" DockPanel.Dock="top"     
  Height="26" VerticalAlignment="top" HorizontalAlignment="Stretch" SelectedValue="{Binding        
  Path=Categ3Filter}"  ItemsSource="{Binding Path=Categ3Values,Mode=OneWay}"  Margin="3,0" />

my declaration property in MVVM
public static readonly DependencyProperty Categ3FilterProperty = DependencyProperty.Register
("Categ3Filter", typeof(string), typeof(ControlerEvtConsult), new UIPropertyMetadata (Dcns.SmsType.Shipmaster.Plugins.StorageUnitPlugin.Properties.Resources.RES_LIB_ALL));

 public static readonly DependencyProperty Categ3ValuesProperty = DependencyProperty.Register
    ("CategValues3", typeof(ArrayList), typeof(ControlerEvtConsult), new UIPropertyMetadata(null));

Could you please help ?

Answer 1

Not sure I understand the question, but if you want changes in the ComboBox to update Categ3Values you need to use a TwoWay binding:

<ComboBox Name="ComboCateg3" SelectionChanged="Filter_SelectionChanged" DockPanel.Dock="top" 
Height="26" VerticalAlignment="top" HorizontalAlignment="Stretch" SelectedValue="{Binding        
Path=Categ3Filter}"  ItemsSource="{Binding Path=Categ3Values,Mode=TwoWay}"  Margin="3,0" />