Question

I have a multiselect combobox that works fine. Except for the text. I want it to always have the same text (“Commodity Filter”) regardless of what the user has selected.

If I set iseditable to true and the text to CommodityFilter it looks fine until the user makes a selection, then it is garbage (displays object type name). How can I hard code some text there? (Actually ideally i would databind it so it can change depending on whether anything is selected, but that would be a bonus at this point)

 <ComboBox IsEditable="True" Text ="Commodity Filter" ItemsSource="{Binding Path=ActiveCommodities}">
                <ComboBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <CheckBox IsChecked="{Binding IsSelected}"
                                      Width="20" />
                            <TextBlock Text="{Binding Commodity}"
                                       Width="100" />
                        </StackPanel>
                    </DataTemplate>
                </ComboBox.ItemTemplate>
            </ComboBox>

Answer 1

I ended up creating a custom object for populating the ComboBox (which had the IsSelected property and implemented INotifyPropertyChanged) because I was creating several comboboxes to control filtering. Once I did this is was trivial to override the tostring on the customobject and pass in the appropriate text. So the xaml did not change much.

I would have preferred to overlay with a text box but that seemed to be beyond my abilities to get a polished look in a reasonable time.

   <ComboBox  ItemsSource="{Binding Path=ActiveFuturesMonths}"
               IsEditable="True"
               IsReadOnly="True"
               Text="Futures Month Filter" >
        <ComboBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <CheckBox IsChecked="{Binding IsSelected}"
                              Width="20" />
                    <TextBlock Text="{Binding Text}"
                               Width="100" />
                </StackPanel>
            </DataTemplate>
        </ComboBox.ItemTemplate>
    </ComboBox>