Checkbox in item isn't checked

[Gilbert van Veen]

Hi,

I have a radcombobox with items which are filled by my own routine.
In the combobox there is a context menu with two options:

- Check all
- Uncheck all

When I select one of the above I want to itterate trough the items and set the checkbox to true or false. I call my routine and I see that the Entitype.IsChecked is set but the checkbox in the combobox isn't updated?

<telerikInput:RadComboBox
                                    x:Name="Tra_EntityTypeList" Width="150" Height="25" HorizontalAlignment="Left" Tag="EntityList"
                                    ClearSelectionButtonContent="None" IsEnabled="True" FontStyle="Italic" EmptyText="Selection" MaxDropDownHeight="225" DropDownClosed="ItemsChecked">
                            <telerikInput:RadComboBox.ItemTemplate>
                                <DataTemplate x:Name="EntityTemplate">
                                    <Grid Margin="0" Width="200">
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="25"/>
                                            <ColumnDefinition Width="175" />
                                        </Grid.ColumnDefinitions>
                                        <Grid.RowDefinitions>
                                            <RowDefinition />
                                        </Grid.RowDefinitions>
                                        <CheckBox Grid.Column="0" Margin="0" Name="CheckBoxForEntityType" IsChecked="{Binding IsChecked, Mode=TwoWay}"/>
                                        <TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding Description}" Tag="EntityType">
                                            <!--Context menu-->
                                            <telerik:RadContextMenu.ContextMenu>
                                                <telerik:RadContextMenu Opened="RadContextMenu_Opened" ItemClick="RadContextMenu_ItemClick">
                                                    <telerik:RadContextMenu.Items>
                                                        <telerik:RadMenuItem Header="Select all" Tag="EntSelectAll" />
                                                        <telerik:RadMenuItem Header="Select none" Tag="EntSelectNone" />
                                                    </telerik:RadContextMenu.Items>
                                                </telerik:RadContextMenu>
                                            </telerik:RadContextMenu.ContextMenu>
                                        </TextBlock>
                                    </Grid>
                                </DataTemplate>
                            </telerikInput:RadComboBox.ItemTemplate>
                        </telerikInput:RadComboBox>

The code behind is:

switch (_Type)
            {
                case "EntityType":
                    int i = 0;
                    foreach (EntityType MySelectedEntityType in Tra_EntityTypeList.Items)
                    {
                        MySelectedEntityType.IsChecked = true;
                        i++;
                    }
                    break;
            }

I hope someone can help me with this.

[Yana]

Hello Gilbert van Veen,

You should implement INotifyPropertyChanged interface in order to notify that IsChecked property has been changed and thus to force the combobox items to take the new value. I've attached an example based on your code to demonstrate the approach.

All the best,
Yana
the Telerik team

[Gilbert van Veen]

Hi,

Many thanks!! I totally forgot to use the INotifyChanged option.

It works perfect!.