Hi,
is it possible to have some kind of automatic page scrolling, so that the last added item is always visible?

I mean, while the software continues to add items, and the items reach the bottom of the grid, then you can't see the new items added unless you continuously scroll down *each new item added*!
The behaviour I want is that the grid automatic scroll down, letting the last item inserted to stay visible at the bottom of the page: is thi possible?

Thanks

when I MultipleSelect userContorl   or RadGridView Multiple Select rows  is   error  System.NullReferenceException

please help me : 
error message

"   in System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()\r\n 
in System.Windows.Automation.Peers.AutomationPeer.GetChildren()\r\n  
in System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n 
in System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n 
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n 
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n 
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n 
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n 
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)\r\n 
在 System.Windows.Automation.Peers.AutomationPeer.ValidateConnected(AutomationPeer connectedPeer)\r\n
在 System.Windows.Automation.Peers.AutomationPeer.AutomationPeerFromInputElement(IInputElement focusedElement)\r\n 
在 System.Windows.Automation.Peers.AutomationPeer.RaiseFocusChangedEventHelper(IInputElement newFocus)\r\n
在 System.Windows.Input.KeyboardDevice.ChangeFocus(DependencyObject focus, Int32 timestamp)\r\n
在 System.Windows.Input.KeyboardDevice.TryChangeFocus(DependencyObject newFocus, IKeyboardInputProvider keyboardInputProvider, Boolean askOld, Boolean askNew, Boolean forceToNullIfFailed)\r\n
在 System.Windows.Input.KeyboardDevice.Focus(DependencyObject focus, Boolean askOld, Boolean askNew)\r\n
在 System.Windows.Input.KeyboardDevice.Focus(IInputElement element)\r\n 
在 System.Windows.UIElement.Focus()\r\n 
在 Telerik.Windows.Controls.GridView.EditContext.OnCellMouseDown(GridViewCell cell)
位置 c:\\Builds\\WPF_Scrum\\Release_WPF\\Sources\\Development\\Controls\\GridView\\GridView\\GridView\\Editing\\EditContext.cs
:line 292\r\n
在 Telerik.Windows.Controls.GridView.GridViewCell.OnMouseLeftButtonDown(MouseButtonEventArgs e)
位置 c:\\Builds\\WPF_Scrum\\Release_WPF\\Sources\\Development\\Controls\\GridView\\GridView\\GridView\\Cells\\GridViewCell.cs:行号 370\r\n
在 System.Windows.UIElement.OnMouseLeftButtonDownThunk(Object sender, MouseButtonEventArgs e)\r\n
在 System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)\r\n
在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)\r\n
在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)\r\n
在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)\r\n
在 System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)\r\n 
在 System.Windows.UIElement.CrackMouseButtonEventAndReRaiseEvent(DependencyObject sender, MouseButtonEventArgs e)\r\n 
在 System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)\r\n
在 System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)\r\n
在 System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)\r\n 
在 System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)\r\n
在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)\r\n
在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)\r\n
在 System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)\r\n
在 System.Windows.Input.InputManager.ProcessStagingArea()\r\n 
在 System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)\r\n
在 System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)\r\n
在 System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)\r\n 
在 System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)\r\n  
在 System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)\r\n
在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)\r\n
在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)\r\n
在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)\r\n
在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)\r\n 
在 System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)\r\n 
在 System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)\r\n  
在 System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)\r\n 
在 MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)\r\n  
在 MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)\r\n 
在 System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)\r\n
在 System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)\r\n
在 System.Windows.Threading.Dispatcher.Run()\r\n 
在 System.Windows.Application.RunDispatcher(Object ignore)\r\n 

Hi

when clicking on Automatic in the ColorPicker control included in my xaml as follows:

<telerik:RadColorPicker SelectedColorChanged="RadColorPicker_SelectedColorChanged" Tag="Foreground" Margin="5 0 5 0"/>

a System.NullReferenceException is thrown.

Sincerely.

I have a listbox that shows dates, when a user clicks on a specific date I want it to become editable. So when I click on the listbox item, a trigger switches its datatemplate from a template containing a textblock to a template containing a RadDatePicker.

When this occurs, the RadDatePicker immediatley updates the binding source with the value.  Why is this?  The WPF Toolkit date picker does not do this, but I'd have to use the RadDatePicker.

Because I am using entity framework self tracking entities, this immediatley marks the entity I've bound to as modified.

Does anyone know a way to stop the RadDatePicker updating the binding source as soon as it appears on a datatemplate?

I've recreated this problem in a test window.  The XAML looks like this:


... and the .cs looks like:


Thanks for any help!
Simon.

Hi,

I am using a RadChart control with multiple RadChartAreas defined. I wanted to show individual legends belonging to each Chart area but they aren't visible. Even though I followed the examples but couldn't get the legends to display.

Here's my source code:

<telerik:RadChart x:Name="LineChartCusips" ScrollViewer.CanContentScroll="True">
                    
                    <Grid Margin="0,0,10,0">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="5*" />
                            <ColumnDefinition Width="2*" />                            
                        </Grid.ColumnDefinitions>
                        <telerik:ChartTitle Grid.Row="0"  
                                            Grid.ColumnSpan="2"
                                            Content="Year 2010"
                                            HorizontalAlignment="Center"                                            
                                            Style="{StaticResource CustomTitleStyle}"/>
                        
                        <telerik:ChartArea Grid.Row="1"
                                           Grid.Column="0"
                                           Grid.ColumnSpan="2"
                                           Padding="5,10,20,5"
                                           x:Name="splineChartArea"
                                           LegendName="splineLengend"                                           
                                           ItemToolTipOpening="splineChartArea_ItemToolTipOpening"/>
                        
                        <telerik:ChartTitle Grid.Row="2"
                                            Content="Monthly Distribution"
                                            Grid.ColumnSpan="2"
                                            HorizontalAlignment="Center"
                                            Style="{StaticResource CustomTitleStyle}"/>
                        
                        <telerik:ChartArea Grid.Row="3"
                                           Grid.Column="0"
                                           x:Name="barChartArea"
                                           LegendName="barLegend"
                                           ItemToolTipOpening="ChartArea2_ItemToolTipOpening"/>
                        
                        <telerik:ChartArea Grid.Row="3"
                                           Grid.Column="1"
                                           x:Name="pieChartArea"
                                           />
                      
                                                
                    </Grid>

For one of the chart areas, splineLengend, here's the code behind:
DataSeries newSeries = new DataSeries();
                newSeries.LegendLabel = tranchedata.Key.ToString();
                newSeries.Definition = new LineSeriesDefinition();
                newSeries.Definition.InteractivitySettings.HoverScope = InteractivityScope.Series;
                newSeries.Definition.InteractivitySettings.SelectionScope = InteractivityScope.Series;                
                newSeries.Definition.ShowItemLabels = true;
                newSeries.Definition.ShowItemToolTips = true;

Thanks,
Farhan

Several weeks before the official release we wanted to give a preview of some of the major new controls and features coming in Q3 2010.

The new ScheduleView control for WPF 

As we announced in the beginning of this quarter we started working on a brand new scheduling component. Now that the first bits appeared you can find the new ScheduleView in the RadControls for WPF bundle. We decided to develop this new control as we wanted to prepare a really advanced Scheduling control that would fit in any application scenario. You can review the major features of the control on its product page. You can expect identical behavior, featureset and API for the ScheduleView for Silverlight that will officially come shortly after Q3 2010. 

Data Virtualization

With our 2010 Q3 Beta release we are introducing the concept of Data Virtualization - a new extension to our LINQ based data engine. The Data Virtualization technique ensures great performance and user experience improvements especially when dealing with very large datasets. The “heart” of Data Virtualization is the VirtualQueryableCollectionView class, which is responsible for loading on demand the needed chunks of data to the client. 

Data virtualization enables smooth scrolling experience in all data bound controls, which makes the components responsive all the time regardless the amount of data you present. To work properly you should use controls with UI virtualization like RadGridView, RadTreeView, RadBook, RadComboBox.

Sparklines

Sparklines are used for quick graphical data visualization in the context of words, numbers or images. Their simple design and clear readability are the best way to present important business or other trends. The Sparklines are designed to be very small in size so they can perfectly fit in any text or simple grid along with other numeric data.

You can download the installation files under your accounts. The files are marked with Q3 2010 Beta.

Online demos are available at:
RadControls for WPF

We will greatly appreciate your feedback in this Beta forum.

The default scrolling behavior of a ListBox is that the scrolling goes by one item at a time. The scrolling is not smooth but as you scroll the ListBox jumps to the next item. Although if you want to you can get the ListBox to scroll smoothly by setting ScrollViewer.CanContentScroll="False".

 

The RadGridView seems to have the opposite default scrolling behavior. The RadGridView scrolls smoothly in both vertical (rows) and horizontal (columns) directions.

 

Is it possible to make the RadGridView scoll by one row or column at a time, like the ListBox does by default with its items?

 

I've tried setting ScrollViewer.CanContentScroll="True" but without luck.

WPF VS2010

OK, I read through everything I could find and could not find the answer I was looking for.  How can I add an item to the list of options?  I don't want to completely create a new filter control but I want to add "Is Null", "Is Not Null" to the list of choices.  Is that possible?

I use a RadGridView to show data. The user is allowed to sort by any column by clicking it, using the built-in sorting feature. This works fine.

 

The problem occurs when the rows in the gridview are replaced. The gridview is always filled with rows after the user has done a search. However, the new rows are not sorted in the specified way.

 

Example:

The user does a search which fills the gridview with rows.

The user clicks the header of column A to sort by that column.

The user does a new search which fills the gridview with new  rows.

The gridview now still indicates that is is sorted by column A, but the rows are NOT sorted in that way

 

Is this a bug or "by design"? Is there any way to solve my problem?

 

If no better solution exist, I was thinking that maybe I can manually tell the gridview to sort the rows according to its current sorting state after I have filled it with new rows. But I cannot find a way to do that neither...

I'm binding the RadGridView to an ObservableCollection of about 1,000 items or so. I have both Row and Column Virtualization turned on. When I'm displaying my grid cells as plain TextBlocks, the realtime scrolling performance is pretty decent (Immediate scrolling is not an option). But once I start using more complex templates, like my own custom editors, scrolling performance suffers greatly, and becomes very choppy. The grid definition looks something like:

   <telerik:RadGridView
                         ItemsSource="{Binding MyItemsSource}"
                         ScrollMode="RealTime"
                         SelectionMode="Extended"
                         AutoGenerateColumns="False"
                         EnableColumnVirtualization="True"
                         EnableRowVirtualization="True">

and the columns looks like:

 <telerik:GridViewDataColumn Header="Price">

                <telerik:GridViewDataColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Price.Value}" />
                    </DataTemplate>
                </telerik:GridViewDataColumn.CellTemplate>

            </telerik:GridViewDataColumn>

Even if I keep the entire grid as TextBlocks but just make even a couple of columns TextBoxes, the scrolling performance starts to degrade fairly quickly. If  I disable both row and column Virtualization completely, then the grid scrolls very fast, but starts to take up a lot of memory (because it's instantiating all of the visual trees, it's something around 1GB memory usage). Are there any other settings that can help with the scrolling performance, or anything else that I can do ? I've found the grid very performant is almost all other scenarios, and it would be a shame to discard an otherwise well performing grid because of lackluster scrolling.