GridViewComboBoxColumn doesn't show items until clicked on

[Joshua]

I'm not sure if this has something to do with the Async calls or what, but here's the situation.

I have two tables in my database, DB1 and DB2. Here's the schema:

DB1
ARecordID
ARecord
AIsActive

DB2
BRecordID
ARecordID (foreign key)
BRecord
BFeedIdentifier
BIsActive

My XAML:

<riaControls:DomainDataSource AutoLoad="True" d:DesignData="{d:DesignInstance MyApp:RecordsA, CreateList=True}" Height="0" LoadedData="recordsADomainDataSource_LoadedData" Name="recordsADomainDataSource" QueryName="GetRecordsA" Width="0">
    <riaControls:DomainDataSource.DomainContext>
        <MyApp:MyAppContext />
    </riaControls:DomainDataSource.DomainContext>
</riaControls:DomainDataSource>
<riaControls:DomainDataSource AutoLoad="True" d:DesignData="{d:DesignInstance MyApp:RecordsB, CreateList=True}" Height="0" LoadedData="recordsBDomainDataSource_LoadedData" Name="recordsBDomainDataSource" QueryName="GetRecordsB" Width="0">
    <riaControls:DomainDataSource.DomainContext>
        <MyApp:MyAppContext />
    </riaControls:DomainDataSource.DomainContext>
</riaControls:DomainDataSource>
<telerik:RadGridView HorizontalAlignment="Left" Name="rgvRecords"
                    VerticalAlignment="Top" ShowGroupPanel="False"
                    RowIndicatorVisibility="Collapsed"
                    CanUserDeleteRows="True"
                    ShowInsertRow="True"
                    CanUserReorderColumns="False"
                    CanUserResizeColumns="False"
                    AutoGenerateColumns="False"
                    CanUserFreezeColumns="False"
                    ItemsSource="{Binding ElementName=recordsBDomainDataSource, Path=Data}"
                    IsBusy="{Binding IsBusy, ElementName=recordsBDomainDataSource}"
                    Deleted="rgvRecords_Deleted"
                    Margin="0,50,0,0"
                    RowEditEnded="rgvRecords_RowEditEnded">
    <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn Header="" Width="75" IsFilterable="False" IsReadOnly="True">
            <telerik:GridViewDataColumn.CellTemplate>
                <DataTemplate>
                    <telerik:RadButton Margin="5" Command="telerik:RadGridViewCommands.Delete" CommandParameter="{Binding}">Delete</telerik:RadButton>
                </DataTemplate>
            </telerik:GridViewDataColumn.CellTemplate>
        </telerik:GridViewDataColumn>
        <telerik:GridViewComboBoxColumn Width="200" Header="A Record" DataMemberBinding="{Binding ARecordID, Mode=TwoWay}" ItemsSource="{Binding ElementName=recordsADomainDataSource, Path=Data}" SelectedValueMemberPath="ARecordID" DisplayMemberPath="ARecord">
        </telerik:GridViewComboBoxColumn>
        <telerik:GridViewDataColumn Header="B Record" DataMemberBinding="{Binding BRecord, Mode=TwoWay}" Width="*" IsFilterable="False" />
        <telerik:GridViewDataColumn Header="B Feed Identifier" DataMemberBinding="{Binding BFeedIdentifier, Mode=TwoWay}" Width="*" IsFilterable="False" />
        <telerik:GridViewDataColumn Header="Active" DataMemberBinding="{Binding BIsActive, Mode=TwoWay}" Width="150">
            <telerik:GridViewDataColumn.CellTemplate>
                <DataTemplate>
                    <CheckBox Click="CheckBox_Click" IsChecked="{Binding BIsActive, Mode=TwoWay}" IsEnabled="True" />
                </DataTemplate>
            </telerik:GridViewDataColumn.CellTemplate>
        </telerik:GridViewDataColumn>
    </telerik:RadGridView.Columns>
</telerik:RadGridView>

First off, all the data is binding fine.  However, I'm experiencing a little quirk.  When the page first renders, all the data is displayed EXCEPT the bound items for the GridViewComboBoxColumn.  However, once I click on the one of the records in the GridViewComboBoxColumn, the entire column shows all the correctly bound data.

I've tried multiple things like Column.Refresh after the grid has loaded. I've tried setting the grid's datasource's AutoLoad to false and then upon recordsADomainDataSource load, call recordsBDomainDataSource.Load().  I've tried a few other things, but to no avail.

How do I get the GridViewComboBoxColumn to show the data automatically on load without having to click on it?

Thanks,
Joshua

[Joshua]

just "bumping" this post again.  Any help on this would be great.

Thanks,
Joshua

[Veselin Vasilev]

Hi Joshua,

This troubleshooting article should be of help:
Empty Cells in Combobox column

Kind regards,
Veselin Vasilev
the Telerik team

[Leos]

I have the same problem with two RadDomainDataSource.

My RadGridView is connected to first RDDS (VM property View):
QueryableDomainServiceCollectionView<Measure>
... where Measure  contains MeasureTypeId property/column.

GridViewComboBoxColumns is connected to VM and second RDDS (VM property  ViewMeasureType):
QueryableDomainServiceCollectionView<MeasureType>
... where MeasureType contains Id (key) and Name (description)

<telerik:RadGridView Grid.Row="2" ItemsSource="{Binding View}" AutoGenerateColumns="False"  >
 <telerik:RadGridView.Columns>
  <telerik:GridViewDataColumn Header="Date" DataMemberBinding="{Binding MeasureDate,Mode=TwoWay}"  Width="100"/>
  <telerik:GridViewComboBoxColumn Header="Typ" UniqueName="MeasureTypeId" ItemsSource="{Binding ViewMeasureType}" DisplayMemberPath="Name" SelectedValueMemberPath="Id" DataMemberBinding="{Binding MeasureTypeId, Mode=TwoWay}" />
 </telerik:RadGridView.Columns>
</telerik:RadGridView>

After loading data no value is displayed (in ComboBox column), in DB is all OK.

Described solution is very problematic from ViewModel point of view.

Leos

[Pavel Pavlov]

Hi Joshua,


Please try placing the second RDDS in a static resource. Then for the ItemsSource binding in the combo column please use binding to this static resource . This should do the trick.

Regards,
Pavel Pavlov
the Telerik team

[Leos]

Sorry, it does not work (I added my VM with RDDS to StaticResource).
Could you add some example?
For me is working only setting ItemsSource in CodeBehind (and this is bad from VM point of view).

Edit:
I am Leos, Joshua started this thread in past.

[Maya]

Hi Joshua,

I am sending you a sample project demonstrating the proposed solution. 
Let me know if you need any further assistance.

Kind regards,
Maya
the Telerik team