The tag Application in App.xaml is in error, after apply new theme at project

I chose VisualStudio2013 theme, I click "Configure Project" on my project, chose controls and theme, after that, it appears strange error:

"Object reference not set to an instance of object" highlighting Application tag. Why?

Hi,

I have few tabs in TabControls. Application has ability to switch themes in runtime.

I need highlight some tabs due to some actions (e.g. new message received in the system and messages tab will be highlighted) in runtime. This might be blinking tab header but it should be in the current theme colors, for example if I set blue color for tab header - in some cases it will be ok, but if selected theme who has blue tabs by default - highlighted tab will be not visible. 

How this can be implemented using viewmodel property binding or something like this. Do you have any examples or article?

Thank you

Hello,

We are currently using the radmap control to display a shape file (1MB) showing a map of the world.

The virtualization engine is also used in order to maximize the performance for this relatively large shape file.

It is used as follow (largely inspired by telerik examples):

A menu is displayed when the map is right clicked. It allows to add a start or a waypoint. A line is traced between the rectangles item

Firts issue :

When the map is right clicked the menu is shown, but the shape file disappears.

Moving the map will correct this.

Second issue :

While zooming out the lines and the rectangle disappears , while the shape file is correctly displayed.

Here is apart of the code behind :

Is there a way that the items and the shapefile keep displaying

Hi,

I'm trying to create a solution based off the "Dynamic Number of Series" sample in the RadChartView documentation.  My xaml looks like this:

<telerik:RadCartesianChart x:Name="chart">
     <telerik:RadCartesianChart.HorizontalAxis>
           <telerik:LinearAxis Minimum="{Binding XAxisMin}" Maximum="{Binding XAxisMax}">
                <telerik:LinearAxis.LabelStyle>
                     <Style TargetType="TextBlock">
                          <Setter Property="Foreground" Value="{DynamicResource MainForegroundColor}"/>
                     </Style>
                </telerik:LinearAxis.LabelStyle>
           </telerik:LinearAxis>
      </telerik:RadCartesianChart.HorizontalAxis>
      <telerik:RadCartesianChart.VerticalAxis>
            <telerik:LinearAxis Minimum="{Binding YAxisMin}" Maximum="{Binding YAxisMax}">
                 <telerik:LinearAxis.LabelStyle>
                      <Style TargetType="TextBlock">
                           <Setter Property="Foreground" Value="{DynamicResource MainForegroundColor}"/>
                       </Style>
                   </telerik:LinearAxis.LabelStyle>
               </telerik:LinearAxis>
           </telerik:RadCartesianChart.VerticalAxis>
           <telerik:RadCartesianChart.SeriesProvider>
               <telerik:ChartSeriesProvider Source="{Binding MyVMs}">
                   <telerik:ChartSeriesProvider.SeriesDescriptors>
                       <telerik:ScatterSeriesDescriptor ItemsSourcePath="PointVMs" XValuePath="XValue" YValuePath="YValue">
                           <telerik:ScatterSeriesDescriptor.Style>
                               <Style TargetType="telerik:ScatterPointSeries">
                                   <Setter Property="PointTemplate">
                                       <Setter.Value>
                                           <DataTemplate>
                                               <Ellipse Width="10" 
                                                        Height="10" 
                                                        Fill="{Binding Path=DataItem.HighlightColor, RelativeSource={RelativeSource AncestorType=telerik:ChartSeriesProvider}}" />                                                
                                           </DataTemplate>
                                       </Setter.Value>
                                   </Setter>
                               </Style>
                           </telerik:ScatterSeriesDescriptor.Style>
                       </telerik:ScatterSeriesDescriptor>
                   </telerik:ChartSeriesProvider.SeriesDescriptors>
               </telerik:ChartSeriesProvider>
           </telerik:RadCartesianChart.SeriesProvider>
</telerik:RadCartesianChart>

I can't seem to find the right combination to gain access to the MyVM.HighlightColor so I can set the Fill in my DataTemplate.  Is there a way to do this or is it a case of having to add the color over and over again inside each PointVM?

Thanks for an guidance,

Craig

I have a listBox related with RadTransitionControl , when i change selected item of the listBox , i want to change all the content in the RadTransitionControl 

(Inject an other userControl)

Hi,

How can I add a sumfunction to a GridViewExpression column?
for a GridViewDataColumn I simply add:

<telerik:GridViewDataColumn.AggregateFunctions>
            <telerik:SumFunction />
</telerik:GridViewDataColumn.AggregateFunctions>

and it works 100%, but when I do it for the same for GridViewExpressionColumn:

<telerik:GridViewExpressionColumn.AggregateFunctions>
            <telerik:SumFunction />
 </telerik:GridViewExpressionColumn.AggregateFunctions>

I get an error "No Generic method 'Sum' on type 'System.linq.Enumerable' is compatible with the supplied type arguments".
The data in GridViewDataColumns is of Type Decimal, do i need to set the type of the expression column? if so, how?

thanks.

regards,
Matthew

Hello Telerik,

I'm using RadListBox with binding ItemsSource to CollectionViewSource and switched off IsSynchronizedWithCurrentItem...

And it's nessesary to give option select all within keyboard manipulation.

What can you suggest in this case?

With regards, Anatoliy

Hi, I create a diagrampane. When display in the docking, the Diagram shows fast, but the thumbnail shows after a few seconds. Perhaps the diagram has many  items, have some method for display the two synchronously? 

thanks

Main code:

RadDocumentPane diagramPane = new RadDocumentPane();

MyUserControl diagramUserControl = new MydiagramUserControl(diagram , true);

MyWindow.PaneGroup.Items.Add(diagramUserControl);

MydiagramUserControl code:

MydiagramUserControl(RadDiagram diagram, bool isNeedThumbnail){

    InitializeComponent();

    this.diagramPane.Children.Add(diagram);

    if(isNeedThumbnail){

        RadDiagramThumbnail diagramThumbnail = new RadDiagramThumbnail(){Diagram = diagram};

        diagramThumbnail.VerticalAlignment = VerticalAlignment.Bottom;

        diagramThumbnail.HorizontalAlignment = HorizontalAlignment.Left;

        diagramThumbnial.Width = 150;

        diagramThumbnail.Height = 100;

        this.diagramPane.Children.Add(diagramThumbnail);

    }

}

Hi,

I encountered an issue with the RadNumericUpDown control. I have defined the UpdateValueEvent to PropertyChanged, this works fine as long as I am entering valid numeric values. But in case that I just delete the whole text from the NumericUpDown control the value is not updated in my viewmodel because the setter for the binded value is not called. When I leave the RadNumericUpDown afterwards the setter is called correctly and the value in my viewmodel is set to null.

This is my definition in XAML

<telerik:RadNumericUpDown Value="{Binding DurationFrom, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                ValueFormat="Numeric" NumberDecimalDigits="0" ShowButtons="True"
                Minimum="1" Maximum="{Binding DurationTo, Mode=OneWay, TargetNullValue=1.0}"
                NullValue="" UpdateValueEvent="PropertyChanged" />

Is this a known issue with the NumericUpDown control and is there any workaround for this?

Regards,

Micha