Some weeks ago I implemented a CustomGridViewToggleRowDetailsColumn class.  Basically, my data model has objects called Reads which can have zero or more Alarms associated with them.  I've written code which populates an array in the Read view model object with all of the Alarms that are associated with that particular Read.  The class hides the toggle button for the row details if the item in the row doesn't have any rows in that array.  There's another boolean property on the Read view model object called HasAlarms which is true if the Alarms array isn't empty.

In order to improve performance, I need to rework the data access code so it no longer retrieves all of the Alarms assocated with a Read at the time it retrieves the Reads that match the search criteria.  Instead, I am setting the HasAlarms property to true if there are any Alarms for that Read and leaving the array null. I want the row details toggle button to be hidden if HasAlarms is false (easily done with existing code).  Then, when the user clicks on the toggle button, I want to check to see if the Alarms for that Read were retrieved yet, and if not, go get them.

The problem is that I'm getting an error when the Xaml for the RadGridView is being parsed because it doesn't like something about my code.  The error I'm getting is:

System.Windows.Markup.XamlParseException occurred
  Message='Failed to create a 'Click' from the text 'ExpandAlarms_Click'.' Line number '416' and line position '9'.
  Source=PresentationFramework
  LineNumber=416
  LinePosition=9
  StackTrace:
       at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
       at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
       at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
       at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
       at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
       at CarSystem.CustomControls.Searcher.InitializeComponent() in d:\ElsagTFS\EOC4\Client UI\CustomControls\Searcher.xaml:line 1
       at CarSystem.CustomControls.Searcher..ctor() in D:\ElsagTFS\EOC4\Client UI\CustomControls\Searcher.xaml.cs:line 431
  InnerException: System.ArgumentException
       Message=Error binding to target method.
       Source=mscorlib
       StackTrace:
            at System.Delegate.CreateDelegate(Type type, Object target, String method, Boolean ignoreCase, Boolean throwOnBindFailure)
            at System.Xaml.Schema.SafeReflectionInvoker.CreateDelegate(Type delegateType, Object target, String methodName)
            at System.Xaml.EventConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
            at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateObjectWithTypeConverter(ServiceProviderContext serviceContext, XamlValueConverter`1 ts, Object value)
            at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateFromValue(ServiceProviderContext serviceContext, XamlValueConverter`1 ts, Object value, XamlMember property)
            at MS.Internal.Xaml.Runtime.PartialTrustTolerantRuntime.CreateFromValue(ServiceProviderContext serviceContext, XamlValueConverter`1 ts, Object value, XamlMember property)
            at System.Xaml.XamlObjectWriter.Logic_CreateFromValue(ObjectWriterContext ctx, XamlValueConverter`1 typeConverter, Object value, XamlMember property, String targetName, IAddLineInfo lineInfo)
       InnerException:

Here's the code for my class.  Please help me fix this problem.


Tony

I have a RadDataForm, with a DataFormDataField, that is bound to a Decimal property.

I'm trying to get validation working, and I'm having some issues:

1. When I have a validation error, and the DataFormDataField does not have its Label property set, the error is displayed using the name of the field, instead of the [Display(Name="xxx")] annotation.
2. When I enter invalid characters (non-numeric), my Decimal property's setter is never called, instead the form displays a "Value 'xxx' could not be converted" error. I need to display a more meaningful message.
3. I have a listener on the RadDataForm's ValidatingItem event - but that event is not called when I move focus from one field to another (which is when the above error messages appear.)
4. I need to some level of validation on each keystroke. If the field can only hold 12 characters, an attempt to type a 13th should do nothing. If the user is typing in a field that can only hold numeric values, typing non-numeric characters should do nothing - the keyboard event should be swallowed, and the character should not appear in the field.  At a minimum, letters would be filtered, it'd be better if we could look at the new character and the existing content, and decide whether the new character can be applied without invalidating the field.  (If the field is bound to a decimal, it should allow numbers, and one decimal point. A second decimal point should be swallowed.)

Hi,
I would like to change the +/- symbol on a GridViewToggleRowDetailsColumn so i have created below ControlTemplate

I can set color to the chart axis lines for a 2D chart by setting the AxisElementBrush of the chart control just like this:

mChartControl.AxisElementBrush = new SolidColorBrush(value);

This does not work with 3D charts. How can I get the grid lines to change colors when the chart is 3D? Why is it that I am running into so many problems to get a 3D chart to act the same as a 2D chart? dll version 2011.2.920.40 Thanks, James

Hi. I have a small problem with RadDocking that I'm hoping there is some functionality to solve. We are using the Save/Load Layout methodology for capturing the state of our RadPanes and other controls. This provides a chunk of XML that we save out and load in as required. Unlike the PersistenceManager methodology though, there seems to be no way to prevent certain properties from being added to the XML chunk that's generated when SaveLayout is called on a RadDocking control. When developers change the header of a RadPane, for instance, the change is overwritten when the XML is passed to LoadLayout (even when the RadPane's SerializationTag is changed, which is very strange). I'm wondering if there's some way of preventing the Header property from appearing in the XML, or if we need to take steps to remove it ourselves. It's either this or ignore all of the XML, and leave the controls to assume their default configuration, overwriting the XML.

Many thanks,
- Chris M.

Hi,

We are using RadGridView, RadPanelBar, RadDataFilter, RadBusyIndicator in our application.  We need to be 508 compliant and we were under the impression that Telerik controls were compatible.  When I use Jaws e-reader, navigation panel is not read by the e-reader.  DataFilter's dropdowns are not read, either.  If a user selects a column or filteroperator, they have no idea what they chose.
GridView's headers are skipped when tabbing through and goes into the data rows.  Add new item bar is also skipped.

Is there a property or maybe a setting we need to apply to get RadControls reader ready?

Thanks,

Hi,

i'm using the radCombobox like this:


I want set the selectedItem in the codebehind like this:


SETTINGS.aktsprache = "german"

But it empty every time?!?!?
Is there a "simple" Example?

thanks
regards
rene

I would like to bring a row of my RadGridView into view programatically. I have a more than 100 rows. When I create a row(which I am doing by adding an item to a observable collection) I would like that new row to be selected and bring that into view. I was able to select the new row in my code but could not do the scrolling. More over I want the first cell of the row to be in edit mode so that the user can input text. I am following MVVM pattern for the application and would like to keep zero code in my views. How Can I achieve this?

Any help or suggestion will be appreciated....

Here is some of my code

XAML

<telerik:RadGridView ItemsSource="{Binding AllPartClasses}" 
                     SelectedItem="{Binding SelectedPartClassViewModel, Mode=TwoWay}"         
                     SelectionMode="Single" IsSynchronizedWithCurrentItem="True">

in my view model I did this

void AddNewPartClassExecute()
    {
        PartClass newPartClass = new PartClass();
        PartClassViewModel tempPartClass = new PartClassViewModel(newPartClass);
        tempPartClass.IsInValid = true;
        AllPartClasses.Add(tempPartClass);
        SelectedPartClassViewModel = tempPartClass;
        Global.DbContext.PartClasses.AddObject(newPartClass);

        //OnPropertyChanged("AllPartClasses");
    }
public PartClassViewModel SelectedPartClassViewModel 
    { 
        get
        {  
            return _selectedPartClassViewModel;
        }
        set
        {
            _selectedPartClassViewModel = value;
            OnPropertyChanged("SelectedPartClassViewModel");
        }
    }

I am using RadTreeListView, provided the Xaml below.
I wanted to do validation for the text box column, similar to what is provided for GridView column, 'CellValidating' event where if validation logic fails, text box shows a comment, and the border will become red. Is this supported in RadTreeListView, how can I implement in my code?

 <telerik:RadTreeListView x:Name="MyTree" AutoGenerateColumns="False">
 <telerik:RadTreeListView.Columns>
                    <telerik:GridViewDataColumn x:Name="ObjNameColumn" Header="Name" DataMemberBinding="{Binding Name}" >
                        <telerik:GridViewDataColumn.CellStyle>
                            <Style TargetType="telerik:GridViewCell">
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate>
                                            <Border BorderBrush="LightGray" BorderThickness="0,0,1,0">
                                                <TextBox x:Name="txtBox_NewInstanceName"                                                   
                                                           HorizontalAlignment="Center" VerticalAlignment="Center"    
                                                            Text="{Binding Path=Name, Mode=TwoWay, UpdateSourceTrigger=LostFocus}">
                                                </TextBox>
                                            </Border>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </telerik:GridViewDataColumn.CellStyle>
                    </telerik:GridViewDataColumn>
...
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