I have multiple charts that share the same x-axis and have the trackballs grouped using chartviewutilities.cs from one of your examples. Everything works as expected when there is no zoom. However as soon as I throw a grouped zoom and pan into the mix the trackballs get out of sync. The further I zoom the more out of sync they become. How can i resolve this? 

Here is my charts xaml:

   <telerik:RadCartesianChart Margin="0,17,0,5" TrackBallInfoStyle="{StaticResource trackBallInfoStyle}" TrackBallLineStyle="{StaticResource trackBallLineStyle}" utils:ChartViewUtilities.ChartAlignmentGroup="g1" UseLayoutRounding="True" FontFamily="{DynamicResource FontFamilyRoboto}" Zoom="{Binding Zoom, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type View:MainWindow}}}" PanOffset="{Binding PanOffset, Mode=TwoWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type View:MainWindow}}}" MaxZoom="10000,10000">
            <telerik:RadCartesianChart.HorizontalAxis>
                <telerik:CategoricalAxis SmartLabelsMode="SmartStep" Title="Strip Length (meters)" MajorTickStyle="{StaticResource tickStyle}"/>
            </telerik:RadCartesianChart.HorizontalAxis>
            <telerik:RadCartesianChart.VerticalAxis>
                <telerik:LinearAxis SmartLabelsMode="SmartStepAndRange" MajorTickStyle="{StaticResource tickStyle}"/>
            </telerik:RadCartesianChart.VerticalAxis>
            <telerik:RadCartesianChart.Grid>
                <telerik:CartesianChartGrid MajorLinesVisibility="Y" MajorYLineDashArray="3,4"/>
            </telerik:RadCartesianChart.Grid>
            <telerik:RadCartesianChart.Behaviors>
                <telerik:ChartPanAndZoomBehavior ZoomMode="Horizontal" PanMode="Horizontal" />
                <telerik:ChartTrackBallBehavior ShowIntersectionPoints="True" 
                                                    utils:ChartViewUtilities.ShouldPositionTrackBallCloseToDataPoint="False"
                                                    utils:ChartViewUtilities.TrackBallGroup="g1" TrackInfoUpdated="ChartTrackBallBehavior_TrackInfoUpdated"/>
            </telerik:RadCartesianChart.Behaviors>
            <telerik:LineSeries x:Name="SteelDNALineSeries" CategoryBinding="Position" 
                                        ValueBinding="Value" 
                                        ItemsSource="{Binding Trace, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:ParameterTraceControl}}}"
                                        TrackBallTemplate="{StaticResource SteelDNATrackBallTemplate}" Stroke="{Binding RandomColor, Mode=OneWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type View:MainWindow}}}" StrokeThickness="1"
                                        utils:ChartAnimationUtilities.CartesianAnimation="Rise"/>
        </telerik:RadCartesianChart>

and attached are what happens...

Hi,

I have a LocalDataSourceProvider bound to a DataTable. Some of the columns allow nulls and some of the values in them are DBNull. I would like to be able to display a count of the values that aren't null. I've created my own aggregate function and I can add that to some of my AggregatePropertyDescriptions programmatically. I do have an example, but apparently I'm only allowed to upload images.

The questions I've got are:

Is there any easier way to do this?

Can I make this aggregate function appear in the UI in the Field List, so users can select it?

I only appear to be able to apply this to my nullable int property, and not my string property. Is that something I should be expecting?

Many thanks,

Richard

Hi, I got the code from http://docs.telerik.com/devtools/wpf/controls/radgridview/columns/how-to/scroll-item

My code :

when DropRowIndex = 16 and the items.count=17 , it calls the scrollFailedCallback , I tried to make it this.timetableGrid.Items[this.timetableGrid.Items.Count -1] and it still fails. WHy? My items count is 17 so it should not be failing. I hardcoded it into DropRowIndex = 15 and it is calling scrollFinishedCallback which is what I want to happen. May I ask why rowindex 16 is not working ?

if (this.timetableGrid.Columns.Count > 0 && DropColIndex <= this.timetableGrid.Columns.Count)
            {
                IsScrollBarForceIntoView = false;
                int offsetCol = 0; int offsetRow = 0;
                if ((DropColIndex + 3) <= (this.timetableGrid.Columns.Count - 1))
                    offsetCol = 3;
                if ((DropRowindex + 3) <= (this.timetableGrid.Items.Count - 1))
                    offsetRow = 3;
                this.timetableGrid.ScrollIntoViewAsync(this.timetableGrid.Items[DropRowindex + offsetRow], //the row
                                this.timetableGrid.Columns[DropColIndex + offsetCol], //the column
                                 new Action<FrameworkElement>((f) =>
                                  {
                                      App.MainWindow.IsBusy = false;
                                  }), new Action ( ()=>
                                      {
                                          App.MainWindow.IsBusy = false;
                                      }
                                    ));
                isDrop = false;
            }
            else
            {
                App.MainWindow.IsBusy = false;
                DropColIndex = 0;
            }

I used all resource string files for RadPivotGrid, but the message "Blank" could not find the key for translation. What is the procedure for translating this message?

I have a test project demonstrating the problem but I am not allowed to post

Hi,

I'm using the Q3 2016 version of the Telerik WPF controls suite.  I'm having a problem using a ScatterLineSeries in tandem with the "Batch" option on XamlRenderOptions for the series.  I'm using a ChartSeriesDescriptor with a style for the ScatterLineSeries that has the following:

That "DefaultVisualStyle" resource is defined like so:

When I use those options and add data points via bindings from the ChartSeriesProvider, I get a MissingMethodException, that seems to come from the UIAutomation system:

Is there anything I can do to use Batch for performance on this series?

Hi, I am experiancing an issue with the rad gridView where the binding errors are making the performance impossibe to work with,  the errors I get are

ystem.Windows.Data Information: 21 : BindingExpression cannot retrieve value from null data item. This could happen when binding is detached or when binding to a Nullable type that has no value. BindingExpression:Path=SelectedPane.IsActive; DataItem='RadPaneGroup' (Name=''); target element is 'PaneHeader' (Name='HeaderElement'); target property is 'IsHighlighted' (type 'Boolean')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=SelectedPane.IsActive; DataItem='RadPaneGroup' (Name=''); target element is 'PaneHeader' (Name='HeaderElement'); target property is 'IsHighlighted' (type 'Boolean')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=; DataItem=null; target element is 'RadMenuItem' (Name=''); target property is 'CommandParameter' (type 'Object')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=; DataItem=null; target element is 'RadMenuItem' (Name=''); target property is 'CommandTarget' (type 'UIElement')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=IsFloatingOnly; DataItem=null; target element is 'RadMenuItem' (Name=''); target property is 'IsChecked' (type 'Boolean')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=; DataItem=null; target element is 'RadMenuItem' (Name=''); target property is 'CommandParameter' (type 'Object')
System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=; DataItem=null; target element is 'RadMenuItem' (Name=''); target property is 'CommandTarget' (type 'UIElement')

I have checked that the DataContext is not null, and when using the WPF built in Listbox in place of the RadGridView, I do not get any issues. I have seen the same question asked on StackOverflow with no response

https://stackoverflow.com/questions/17842712/wpf-cannot-retrieve-value-using-the-binding-and-no-valid-fallback-value-exists

Part of my code looks like this :

<telerik:RadGridView x:Name="SummaryGrid" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
                             CanUserDeleteRows="False"
                             CanUserFreezeColumns="False"
                             RowIndicatorVisibility="Collapsed"
                             CanUserResizeColumns="False"
                             AutoGenerateColumns="False"
                             CanUserSortGroups="False"
                             GroupRenderMode="Flat"
                             ShowGroupPanel="False"
                             EnableRowVirtualization="False"
                             ItemsSource="{Binding VerifiedItems, FallbackValue={x:Static constant:FallBackConstants.FallBackBaseConversionsList}}">
            <telerik:RadGridView.Columns>
                -->
        <!--column shown the path -->
        <!--
                <telerik:GridViewDataColumn Width="*"
           Header="Type"
           IsGroupable="False"
                                            DataMemberBinding="{Binding Type}"
           IsFilterable="True"
                                            IsReadOnly="True">
                    <telerik:GridViewDataColumn.CellTemplate>
                        <DataTemplate>
                            <StackPanel HorizontalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Hidden">
                                <TextBlock Text="{Binding Type, FallbackValue={x:Static constant:FallBackConstants.FallBackString}}" />
                            </StackPanel>
                        </DataTemplate>
                    </telerik:GridViewDataColumn.CellTemplate>
                </telerik:GridViewDataColumn>

Is there anything that I might be missing in terms of binding on the RadgridView?

Hello Telerik

In my applycation, I choose a pdf file, create preview image by using ThumbnailFactory, and show file in PdfViewer. But I receive exception as title because Telerik's framework cannot read pdf file with encryption algorithm 4. And PdfViewer  I google this bug and find nothing. So can you provide me some tip, trick to get over this bug. Thank you so much.