Home / Community & Support / Developer Productivity Tools Forums / WPF > Expander > IsExpanded do nothing at startup

• Oliver Master

  Posted on Sep 15, 2011 (permalink)

  Hi,
  
  since I upgraded from V2010.3.1314.35 to V2011.2.712.35, when my application start, my expanders show nothing.
  In my XAML I placed component into my expander and I set the IsExpanded property to True but when my application shown, the button of my expander indicate me that he is expanded but his size still like he have nothing inside him. If I click on the button to collapsed the expander and then reclick on the button to expand my expander, everything appear!!!
  
  Whan I was with version V2010.3.1314.35 it was ok!!!
  
  Here is the piece of code in my XAML
  
  

   

   

  <telerik:RadExpander Name="SignCtxSearchExpander" IsExpanded="False" Style="{DynamicResource REF-RadExpanderStyle-Dark}" telerik:RadDockPanel.Dock="Top" Header="{StaticResource SearchFilter}" VerticalAlignment="Top" GotFocus="SignCtxSearchExpander_GotFocus" LostFocus="SignCtxSearchExpander_LostFocus">

   

   

   

  <Grid Style="{DynamicResource REF-GridStyle-Dark}">

   

   

   

  <telerik:RadDockPanel Style="{DynamicResource REF-RadDockPanelStyle-Dark}">

   

   

   

  <Grid Margin="6" telerik:RadDockPanel.Dock="Bottom">

   

   

   

  <Grid.ColumnDefinitions>

   

   

   

  <ColumnDefinition/>

   

   

   

  <ColumnDefinition/>

   

   

   

  </Grid.ColumnDefinitions>

   

   

   

  <telerik:RadButton Grid.Column="0" HorizontalAlignment="Right" Name="SignCtxBtnSearchByFilters" Content="{StaticResource Search}" Padding="3" Margin="6,0,6,6" Style="{DynamicResource REF-RadButtonStyle-Dark-Main}" Click="SignCtxSearchByFilters_Click" Height="25" />

   

   

   

  <telerik:RadButton Grid.Column="1" HorizontalAlignment="Left" Name="SignCtxBtnResetFilters" Content="{StaticResource Reset}" Padding="3" Margin="6,0,6,6" Style="{DynamicResource REF-RadButtonStyle-Dak-Ligth}" Click="SignCtxResetFilters_Click" Height="25" />

   

   

   

  </Grid>

   

   

   

  <Grid Margin="6" HorizontalAlignment="Center" Style="{DynamicResource REF-GridStyle-Dark}">

   

   

   

  <Grid.RowDefinitions>

   

   

   

  <RowDefinition/>

   

   

   

  <RowDefinition/>

   

   

   

  </Grid.RowDefinitions>

   

   

   

  <Grid.ColumnDefinitions>

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="50" />

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="125" />

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="100" />

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="125" />

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="100" />

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="125" />

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="100" />

   

   

   

  <ColumnDefinition Width="Auto" MinWidth="125" />

   

   

   

  </Grid.ColumnDefinitions>

   

   

   

  <TextBlock Grid.Column="0" Grid.Row="0" HorizontalAlignment="Right" Margin="1" TextWrapping="Wrap" Text="{StaticResource TranscriptionPeriodFrom}">

   

   

   

  <TextBlock.Foreground>

   

   

   

  <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlTextColorKey}}"/>

   

   

   

  </TextBlock.Foreground></TextBlock>

   

   

   

  <TextBlock Grid.Column="0" Grid.Row="1" HorizontalAlignment="Right" Margin="1" TextWrapping="Wrap" Text="{StaticResource PeriodTo}">

   

   

   

  <TextBlock.Foreground>

   

   

   

  <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlTextColorKey}}"/>

   

   

   

  </TextBlock.Foreground></TextBlock>

   

   

   

  <TextBlock Grid.Column="2" Grid.Row="0" HorizontalAlignment="Right" Margin="1" TextWrapping="Wrap" Text="{StaticResource Department}">

   

   

   

  <TextBlock.Foreground>

   

   

   

  <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlTextColorKey}}"/>

   

   

   

  </TextBlock.Foreground>:</TextBlock>

   

   

   

  <TextBlock Grid.Column="4" Grid.Row="0" HorizontalAlignment="Right" Margin="1" TextWrapping="Wrap" Text="{StaticResource Modality}">

   

   

   

  <TextBlock.Foreground>

   

   

   

  <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlTextColorKey}}"/>

   

   

   

  </TextBlock.Foreground>:</TextBlock>

   

   

   

  <TextBlock Grid.Column="2" Grid.Row="1" HorizontalAlignment="Right" Margin="1" TextWrapping="Wrap" Text="{StaticResource Physician}">

   

   

   

  <TextBlock.Foreground>

   

   

   

  <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlTextColorKey}}"/>

   

   

   

  </TextBlock.Foreground>:</TextBlock>

   

   

   

  <TextBlock Grid.Column="6" Grid.Row="0" HorizontalAlignment="Right" Margin="1" TextWrapping="Wrap" Text="{StaticResource VisitNumber}">

   

   

   

  <TextBlock.Foreground>

   

   

   

  <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlTextColorKey}}"/>

   

   

   

  </TextBlock.Foreground>:</TextBlock>

   

   

   

  <TextBlock Grid.Column="4" Grid.Row="1" HorizontalAlignment="Right" Margin="1" TextWrapping="Wrap" Text="{StaticResource ReqCode}">

   

   

   

  <TextBlock.Foreground>

   

   

   

  <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.ControlTextColorKey}}"/>

   

   

   

  </TextBlock.Foreground>:</TextBlock>

   

   

   

  <CheckBox Grid.Column="6" Grid.Row="1" Name="SignCtxUrgent" HorizontalAlignment="Right" VerticalAlignment="Top">Urgent</CheckBox>

   

   

   

  <telerik:RadDatePicker Name="SignCtxFromDate" Margin="1" Grid.Row="0" Grid.Column="1" Height="21" SelectionChanged="SignCtxFromDate_SelectionChanged" />

   

   

   

  <telerik:RadDatePicker Name="SignCtxToDate" Margin="1" Grid.Row="1" Grid.Column="1" Height="21" SelectionChanged="SignCtxFromDate_SelectionChanged" />

   

   

   

  <telerik:RadComboBox Name="SignCtxDepartment" Grid.Column="3" Height="21" Width="175" ClearSelectionButtonVisibility="Visible" ClearSelectionButtonContent="{StaticResource ClearSelection}" />

   

   

   

  <telerik:RadComboBox Name="SignCtxPhysician" Grid.Column="3" Grid.Row="1" Height="21" Width="175" ClearSelectionButtonVisibility="Visible" ClearSelectionButtonContent="{StaticResource ClearSelection}" />

   

   

   

  <telerik:RadComboBox Name="SignCtxModality" Grid.Column="5" Height="21" Width="175" ClearSelectionButtonVisibility="Visible" ClearSelectionButtonContent="{StaticResource ClearSelection}" />

   

   

   

  <telerik:RadMaskedTextBox Name="SignCtxReqCode" Grid.Column="5" Grid.Row="1" Height="21" Width="175" MaskType="None" />

   

   

   

  <telerik:RadMaskedTextBox Name="SignCtxVisitNumber" Grid.Column="7" Grid.Row="0" Margin="1" Width="125" MaskType="None" />

   

   

   

  </Grid>

   

   

   

  </telerik:RadDockPanel>

   

   

   

  </Grid>

   

   

   

  </telerik:RadExpander>

   

  
  Thank's

  Reply

• Oliver Master

  Posted on Sep 16, 2011 (permalink)

  Hi,
  
  I forgot to tell you, if I set "telerik:AnimationManager.IsAnimationEnabled="False"", it's working!!!
  
  Thank's

  Reply

• Tina Stancheva Tina Stancheva

  Posted on Sep 16, 2011 (permalink)

  Hi Oliver,
  
  We recently implemented some changes in teh RadExpander control in order to improve its performance. In order to do so we needed to change its CantrolTemplate as well. And from the code-snippet you sent I noticed that you have defined a custom style for your RadExpander. But you'll need to update it based on the latest defualt ControlTemplate of teh RadExpander. You can use ExpressionBlend to get the latest style of the control and modify it accordingly to your needs. Or you can send us your current custom style and a snapshot of teh styled RadExpander and we will update your style to work with the latest release of the control.
  
  Best wishes,
  Tina Stancheva
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

• Dirk

  Posted on Dec 23, 2011 (permalink)

  Hi
  
  I have managed to track down the IsExpanded bug to a minimal required sample. It seems that if you add a RadComboBox to the Expander control content while it is hosted in another Rad container such as a RadTabControl then the RadExpander does not render the expanded content on the first try.
  
  Use the following code segment to see.
  
  

  <Window x:Class="RadControlsWpfApp1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

          xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" Title="MainWindow" Height="350" Width="525">

    <Grid>

      <telerik:RadTabControl>

        <telerik:RadTabItem Header="MyTabItem">

          <StackPanel>

            <telerik:RadExpander IsExpanded="true">

              <StackPanel>

                <telerik:RadComboBox SelectedItem="{Binding SomeProperty, Mode=TwoWay}"

                                     DisplayMemberPath="Name" ItemsSource="{Binding SomeList}" />

                <Border Background="Blue" Height="100" />

              </StackPanel>

            </telerik:RadExpander>

          </StackPanel>

        </telerik:RadTabItem>

      </telerik:RadTabControl>

    </Grid>

  </Window>

  Reply

• Petar Mladenov Petar Mladenov

  Posted on Dec 28, 2011 (permalink)

  Hi Dirk,

   We are aware of this issue and we have previously logged it in our PITS. The description in the PITS item describes situation similar to your XAML. Unfortunately, we cannot provide an estimated time when this will be resolved. 

  Kind regards,
  Petar Mladenov
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

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