Hi,

I think I found a bug while trying to set the tooltip for the headers. This seems to be a regression. I downloaded the code from this post:

http://www.telerik.com/community/forums/wpf/gridview/displaying-the-radgrid-header-column-tooltip.aspx

Converted the ColumnTooltip project in that post to VS 2010, changed the .NET framework version to 4.0 CP and replaced the telerik dlls with the latest version. I then run the sample and when I hover the mouse over a header the app crashes with the exception below. The tooltip is being set as in:

<Setter Property="ToolTip" Value="{Binding Content, RelativeSource={RelativeSource Self}}"/>

Did this change in later versions?

Here is the exception:
 
System.InvalidOperationException was unhandled
  Message=Specified element is already the logical child of another element. Disconnect it first.
  Source=PresentationFramework
  StackTrace:
       at System.Windows.FrameworkElement.ChangeLogicalParent(DependencyObject newParent)
       at System.Windows.FrameworkElement.AddLogicalChild(Object child)
       at System.Windows.Controls.ContentControl.OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
       at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
       at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
       at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
       at System.Windows.Data.BindingOperations.SetBinding(DependencyObject target, DependencyProperty dp, BindingBase binding)
       at System.Windows.Controls.PopupControlService.RaiseToolTipOpeningEvent()
       at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.DispatcherOperation.InvokeImpl()
       at System.Threading.ExecutionContext.runTryCode(Object userData)
       at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Windows.Threading.DispatcherOperation.Invoke()
       at System.Windows.Threading.Dispatcher.ProcessQueue()
       at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
       at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
       at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
       at System.Windows.Application.RunInternal(Window window)
       at System.Windows.Application.Run()
       at ColumnTooltip.App.Main() in E:\temp\ColumnTooltip\ColumnTooltip\obj\Debug\App.g.cs:line 0
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

Would it be possible to change the column name of a data bound GridView?

I have a GridView bounded to a dataset. Any changes to the data are save back the the database on rowEditEnded event.
My reason for changing column name like NameID or DateOfBirth to Name ID or Date Of Birth to appear as column names as it would look nicer. Would I be able to do that and update to the database on rowEditEnded event.

In the good old version of RadGrid in Asp.Net, it's documented how to use an EditForm with Insert/Update/Cancel, but how is this done in WPF when using MVVM pattern?

I can not find anything in the docs about RadGrid when using MVVM. Is there a separate documentation, or is Telerik ignoring the pattern?

I feel like I must be missing something simple, but I've been through the examples and can't find anything.  I have a gridview bound to a datatable.  The values populate fine, but when I try to edit, the textbox shows up blank.  It works fine if I set AutoGenerateColumns="true", I need to be able to set it to false

      DataTable dt = new DataTable();

public Administration()

 {

     InitializeComponent();

 

 

     dt.Columns.Add("User", typeof(string));

     dt.Columns.Add("Active", typeof(bool));

 

     DataRow row;

     row = dt.NewRow();

     row["User"] = "User1";

     row["Active"] = true;

     dt.Rows.Add(row);

     row = dt.NewRow();

     row["User"] = "User2";

     row["Active"] = true;

     dt.Rows.Add(row);

     row = dt.NewRow();

     row["User"] = "User3";

     row["Active"] = false;

     dt.Rows.Add(row);

     row = dt.NewRow();

     row["User"] = "User4";

     row["Active"] = true;

     dt.Rows.Add(row);

     row = dt.NewRow();

     row["User"] = "User5";

     row["Active"] = false;

     dt.Rows.Add(row);

     row = dt.NewRow();

     row["User"] = "User6";

     row["Active"] = true;

     dt.Rows.Add(row);

 

     rgridUsers.ItemsSource = dt;

 }

Hello,

I would like to use the loading indicator in the WPF GridView for when the DataLoadMode is asynchronous.

I also intend to use instances of the BusyIndicator control in other areas of my application.

I would like the loading indicator in the GridView to look the same as my instances of the BusyIndicator control - is it possible to change the style of GridView indicator? If so, please could you provide an example?

Thanks,

Tom

Hi,

I'm using WPF controls version 2011.2.712.35.
Randomly getting following exception below.

If there is a workaround to this exception please let me know.

Thanks,
Ruben

So, I figured out how to create the Child grid int he code behind, but now I need to have a click event on the Child grid rows. With the following code I get a "Handler type is mismatched" on the order.AddHandler line.

Any help on how to get this to work?

Thanks,

Doug

Hello,

I have a Problem with the Databinding to a RichTextBox that is located in a Datatemplate for a RadCarousel.

Here my Xaml:


The first Problem is the access to the line with <telerik:Span Text="{Binding Redner}" />
How can I make a Binding from Code-behind to the Controls in the Datatemplate?
The second Question is: How can i Bind the Width from the Carousel-Item to the Variable Monitor-Resolution? I need a Width with max 90% from the Carousel.

Sorry for my bad English. I hope you now what i mean.

Thank You

Hi,

i have a GridView with Hierarchy.

1.How can i hide the expand Button.
2.How can i expand with the SelectChanged-Event. And i need the information from the Selected Row.

In your Forum i found a older Solution, but it wont work with the actual Telerik-Build.

Thank you

Hello Telerik team,

When a user enters a value in the editable textbox of the RadCombobox that doesn't matches any of the available list of items then though the selected value is set to null , the text remains in the editable textbox even on lost focus of the RadCombobox.

I have a requirement where I have to perform a validation when the user tabs out of the editable RadCombobox or tries to click on a different control. The validation is to verify if the text entered by the user is available in the list of items and if not then alert the user of this and open the dropdown.

I implemented this validation on PreviewLostKeyboardFocus event as given below. But the problem is this event gets fired even when the focus enters the RadCombobox.

After the Ok button of the alert is clicked and then when I try to click of the dropdown's button, this event gets fired again and so the alert.

Why does this event fires when the focus enters the radcombobox.

Could you please guide me.

Thanks,
Regards,
Mausami