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Question

I have an wpf application.I want to show the selected item in the Combo box. I get an error saying Cant use both DisplayMemberPath and Item Template.

My ItemsSource is not of string type its a class called "StockExchange"

Following is my code :

 <telerik:RadComboBox Grid.Column="1" DisplayMemberPath="StockExchangeName"  Name="cmbStockExchange" Foreground="White" HorizontalAlignment="Left" HorizontalContentAlignment="Center" Margin="118,14,0,0" VerticalAlignment="Top" Width="100" Height="23" ItemsSource="{Binding StockExchange, Mode=TwoWay}" SelectedItem="{Binding SelectedStockExchange,Mode= TwoWay}" telerik:StyleManager.Theme="Summer" TabIndex="3">
                    <telerik:RadComboBox.ItemTemplate >
                        <DataTemplate>

                            <CheckBox Name="StockExchange"  Content="{Binding StockExchangeName}">
                                <i:Interaction.Triggers>
                                    <i:EventTrigger EventName="Checked">
                                        <Commands:EventToCommand Command="{Binding DataContext.StockExchangeCheckedCmd,RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type telerik:RadWindow}}}" CommandParameter="{Binding ElementName=StockExchange}" ></Commands:EventToCommand>
                                    </i:EventTrigger>
                                    <i:EventTrigger EventName="Unchecked">
                                        <Commands:EventToCommand Command="{Binding DataContext.StockExchangeUnCheckedCmd,RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type telerik:RadWindow}}}" CommandParameter="{Binding ElementName=StockExchange}" ></Commands:EventToCommand>
                                    </i:EventTrigger>                                  
                                </i:Interaction.Triggers>
                            </CheckBox>
                        </DataTemplate>
                    </telerik:RadComboBox.ItemTemplate>
  </telerik:RadComboBox>

what is solution for this? how can I display single or multiple selected Items in a Combo box?

Answer 1

 <telerik:RadComboBox Grid.Column="1"   Name="cmbStockExchange" Foreground="White" HorizontalAlignment="Left" HorizontalContentAlignment="Center" Margin="118,14,0,0" VerticalAlignment="Top" Width="100" Height="23" ItemsSource="{Binding StockExchange, Mode=TwoWay}" SelectedItem="{Binding SelectedStockExchange,Mode= TwoWay}" telerik:StyleManager.Theme="Summer" TabIndex="3">
                <telerik:RadComboBox.ItemTemplate >
                    <DataTemplate>

                        <CheckBox Name="StockExchange"  Content="{Binding StockExchangeName}">
                            <i:Interaction.Triggers>
                                <i:EventTrigger EventName="Checked">
                                    <Commands:EventToCommand Command="{Binding DataContext.StockExchangeCheckedCmd,RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type telerik:RadWindow}}}" CommandParameter="{Binding ElementName=StockExchange}" ></Commands:EventToCommand>
                                </i:EventTrigger>
                                <i:EventTrigger EventName="Unchecked">
                                    <Commands:EventToCommand Command="{Binding DataContext.StockExchangeUnCheckedCmd,RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type telerik:RadWindow}}}" CommandParameter="{Binding ElementName=StockExchange}" ></Commands:EventToCommand>
                                </i:EventTrigger>                                  
                            </i:Interaction.Triggers>
                        </CheckBox>
                    </DataTemplate>
                </telerik:RadComboBox.ItemTemplate>

Create a Textblock that Shows the selected item StockExchangeName

<TextBlock Text="{Binding Path=SelectedItem.StockExchangeName, ElementName=cmbStockExchange}" />

Answer 2

If you select CheckBox, no item is shown selected in comboBox because no item is selected since click event is handled by checkbox.

You can bind IsChecked with IsSelected value of ComboBoxItem so that on click of checkbox corresponding item gets selected.

<CheckBox Content="{Binding StockExchangeName}"
            IsChecked="{Binding IsSelected, RelativeSource={RelativeSource 
                                Mode=FindAncestor, AncestorType=ComboBoxItem}}"/>

This will show checkBox in comboBox because you have provided template with checkBox in it for comboBoxItem.