Trouble setting ItemSource for RadComboBox within GridViewComboBoxColumn

[christine]

I am binding programatically to a GridViewComboBoxColumn (see C# below) and I am using the CellTemplate to display a RadComboBox instead of text.  The problem is that I do not know how to set the ItemSource for the RadComboBox in order to make it work.  Thanks in advance for any help!

((GridViewComboBoxColumn)this.RadGridView_TrusteeLedgers.Columns[1]).ItemsSource = trustees;

<telerik:GridViewComboBoxColumn Header="Trustee" DataMemberBinding="{Binding TrusteeID}" SelectedValueMemberPath="TrusteeID" DisplayMemberPath="TrusteeCode" Width="60" Name="Trustee">
    <telerik:GridViewComboBoxColumn.CellTemplate>
        <DataTemplate>
            <telerik:RadComboBox
                    ItemsSource="???"
                    SelectedValuePath="TrusteeID"
                    telerikControls:Theming.Theme="Office_Blue"
                    SelectedValue="{Binding TrusteeID, Mode=TwoWay}"
                    DisplayMemberPath="TrusteeCode" />
        </DataTemplate>
    </telerik:GridViewComboBoxColumn.CellTemplate>

[Maya]

Hello Christine,

You can find the RadComboBox from each row as follows:

RadComboBox comboBox = row.ChildrenOfType<RadComboBox>().FirstOrDefault();

and set its ItemsSource afterwards. You can try working with RowLoaded event for example.

Regards,
Maya
the Telerik team

[christine]

Thank you!  I was thinking maybe there was a way to reference the ItemSource of the GridViewComboBoxColumn in the RadComboBox  using XAML, maybe something like the code below (ItemsSource is still incorrect, this doesn't work but i'm not sure why). 

<telerik:GridViewComboBoxColumn Header="Trustee" DataMemberBinding="{Binding TrusteeID}" SelectedValueMemberPath="TrusteeID" DisplayMemberPath="TrusteeCode" Width="60" Name="Trustee">
    <telerik:GridViewComboBoxColumn.CellTemplate>
        <DataTemplate>
            <telerik:RadComboBox
                    ItemsSource="{Binding ElementName=Trustee, Path=ItemsSource}"
                    SelectedValuePath="TrusteeID"
                    telerikControls:Theming.Theme="Office_Blue"
                    SelectedValue="{Binding TrusteeID, Mode=TwoWay}"
                    DisplayMemberPath="TrusteeCode" />
        </DataTemplate>
    </telerik:GridViewComboBoxColumn.CellTemplate>

[Maya]

Hi Christine,

Basically, you the ElementName binding will nor work when the element (RadComboBox in this case ) is defined in a DataTemplate. What you can try is to expose the class (probably your ViewModel) into the Resources section of your Grid/Window and use it as a StaticResource afterwards. 
For example:

<Window.Resources>
    <local:MyViewModel x:Key="MyViewModel" />
</Window.Resources>


<DataTemplate>
            <telerik:RadComboBox
                    ItemsSource="{Binding MyItemsSource, Source={StaticResource MyViewModel}}"
                    SelectedValuePath="TrusteeID"
                    telerikControls:Theming.Theme="Office_Blue"
                    SelectedValue="{Binding TrusteeID, Mode=TwoWay}"
                    DisplayMemberPath="TrusteeCode" />
        </DataTemplate>

 

Greetings,
Maya
the Telerik team