RadWindow crash if not resized first

[Michel Hardy]

Hello,

I have a user control:

<Grid x:Name="LayoutRoot" Background="White">
    <telerik:RadDockPanel LastChildFill="True" Background="White">
        <telerikNavigation:RadToolBar telerik:RadDockPanel.Dock="Top" telerik:DockingPanel.Dock="Top">
            <telerikNavigation:RadToolBar.Items>
                <Button Name="btnPrint" Content="Print" />
                <Button Name="btnPrevious" Content="Previous" />
                <Button Name="btnNext" Content="Next" />
                <Slider Name="uiZoomSlider" Width="100" Minimum="0.2" Maximum="10" ValueChanged="uiZoomSlider_ValueChanged"
                                Value="1"/>
            </telerikNavigation:RadToolBar.Items>
        </telerikNavigation:RadToolBar>
        <ScrollViewer Name="scvDocument" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
            <telerik:LayoutTransformControl x:Name="ltDocument">
                <telerik:LayoutTransformControl.LayoutTransform>
                    <ScaleTransform x:Name="Scale"/>
                </telerik:LayoutTransformControl.LayoutTransform>
                <Viewbox Name="vbDocument">
                    <Border Name="DocumentContainer" BorderBrush="Gray" BorderThickness="1" />
                </Viewbox>
            </telerik:LayoutTransformControl>
        </ScrollViewer>
    </telerik:RadDockPanel>
</Grid>

Code behind of the user control:

private void uiZoomSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
    if (ltDocument != null)
    {
        ((ScaleTransform)ltDocument.LayoutTransform).ScaleX = e.NewValue;
        ((ScaleTransform)ltDocument.LayoutTransform).ScaleY = e.NewValue;
        ltDocument.ApplyLayoutTransform();
    }
}

I create a RadWindow and set its content with a new instance of my user control:

Telerik.Windows.Controls.RadWindow rw = new Telerik.Windows.Controls.RadWindow();
ucPrintPreview pp = new ucPrintPreview();
rw.Content = pp;
rw.CanClose = true;
rw.CanMove = true;
rw.IsRestricted = true;
rw.Header = "Print Preview";
rw.WindowStartupLocation = Telerik.Windows.Controls.WindowStartupLocation.CenterOwner;
CoaPrintDocument cpd = new CoaPrintDocument();
cpd.Height = 1024;
cpd.Width = 748;
pp.DocumentContainer.Child = (UIElement)cpd;
rw.ShowDialog();

When I show the RadWindow, if I move the slider control to zoom the viewbox. I get the following error (See error.jpg):
Line: 56
Error: Unhandled Error in Silverlight Application
Code: 4008   
Category: RuntimeError      
Message: Layout cycle detected.  Layout could not complete.    
MethodName:     

But if I resize the RadWindow first and then move the slider control, it works without any error.

Anything to work around this problem?

Thank you,
Michel

[Miroslav]

Hi Michel Hardy,

Thank you for reporting this, your Telerik Points have been updated for your feedback.

The issue has been logged here:

http://www.telerik.com/support/pits.aspx#/public/silverlight/3258

Is it possible for you to set a MinHeight to the RadWindow? Then the layout cycle will not be there.

Greetings,
Miroslav
the Telerik team