Wrapping text in GridViewColumn.Header

[D. Omar]

In this thread (http://www.telerik.com/community/forums/silverlight/gridview/wrap-header-text.aspx) it is mentioned that a property is going to be added to text wrapping. Is that there yet or do I sill have to do it as the sample solution in that thread?

Thanks in advance,

-OmarV

[Kalin Milanov]

Hi D. Omar,

Unfortunately the property is not yet available and your best bet is still using the approach described in that thread. I am also attaching you a sample which does the same - it just uses the latest binaries (Q2 SP1).

Greetings,
Kalin Milanov
the Telerik team

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[D. Omar]

Ok, I need to have full crontrol on what goes on which line rather than leaving it to the AlignmentContentPresenter control to do the wrapping. I figured out I could just set it in XAML like this:

<telerikGridView:GridViewDataColumn UniqueName="MyColumn">
   <telerikGridView:GridViewDataColumn.Header>
      <StackPanel>
         <TextBlock Text="Line1" />
         <TextBlock Text="Line2" />
      </StackPanel>
   </telerikGridView:GridViewDataColumn.Header>
</telerikGridView:GridViewDataColumn>

But I need to do it programmatically as the data for the header comes from a data source. I tried the following code and it did not work, am I doing something wrong?

var header = new StackPanel();
header.Children.Add(new TextBlock { Text = "Line1", TextAlignmentTextAlignment=TextAlignment.Center } );
header.Children.Add(new TextBlock { Text = "Line2", TextAlignmentTextAlignment=TextAlignment.Center } );
ret.Header = header;

Here is the exception information:

{System.Windows.Markup.XamlParseException:  [Line: 0 Position: 0]
   --- Inner Exception ---
Element is already the child of another element.
 ---> System.InvalidOperationException: Element is already the child of another element.
   at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.SetValue(INativeCoreTypeWrapper obj, DependencyProperty property, DependencyObject doh)
   at MS.Internal.XcpImports.SetValue(INativeCoreTypeWrapper doh, DependencyProperty property, Object obj)
   at System.Windows.DependencyObject.SetObjectValueToCore(DependencyProperty dp, Object value)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet, Boolean isSetByStyle, Boolean isSetByBuiltInStyle, PropertyInvalidationReason reason)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at System.Windows.Controls.ContentControl.set_Content(Object value)
   at Telerik.Windows.Controls.GridView.GridViewHeaderCell.SetHeaderText()
   at Telerik.Windows.Controls.GridView.GridViewHeaderCell.OnApplyTemplate()
   at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)
   --- End of inner exception stack trace ---
   at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
   at MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name)
   at MS.Internal.XcpImports.FrameworkElement_ApplyTemplate(FrameworkElement frameworkElement)
   at System.Windows.FrameworkElement.ApplyTemplateInternal()
   at System.Windows.Controls.Control.ApplyTemplate()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.<PopulateHeaderAndFooterRows>b__45(GridViewCellBase c)
   at System.Collections.Generic.List`1.ForEach(Action`1 action)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.PopulateHeaderAndFooterRows()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnColumnsCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Controls.GridViewColumnCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
   at Telerik.Windows.Data.RadObservableCollection`1.InsertItem(Int32 index, T item)
   at System.Collections.ObjectModel.Collection`1.Add(T item)
   at Perquest.Payroll.Worksheet.Silverlight.TelerikWorksheetGrid._gridManager_WorksheetColumnsCreated(Object sender, WorksheetColumnsCreatedEventArgs e)}

[Vlad]

Hi,

I've tried this using both our latest internal build and our official service pack and everything worked fine. You can check the attached project.

Best wishes,
Vlad
the Telerik team

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[Mark]

Vlad
Is there an updated solution to this issue. Is the issue going to be addressed in the next release (I am willing to wait for that release!)