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Loaded event called twice

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Docking

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Dogu asked on 15 Dec 2009, 02:36 PM

I have an docking control and adding panes dynamically. But "Loaded" events of the controls called twice. Am I doing something wrong ?
Here's the XAML:

    
            <Telerik:RadDocking Grid.Row="1" Name="xamDockManager1">  
        
                        <Telerik:RadSplitContainer InitialPosition="DockedBottom">  
        
                            <Telerik:RadPaneGroup> 
        
                                <Telerik:RadDocumentPane Header="Mesajlar" CanUserPin="True" CanFloat="False" CanUserClose="False" IsPinned="False" > 
        
                                    <TextBox Style="{StaticResource StyleTextBoxMessages}" AutoWordSelection="True" Name="TextBoxMessages" HorizontalAlignment="Stretch"  VerticalAlignment="Stretch"  HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" Margin="0" IsReadOnly="True">  
        
                                        <TextBox.ContextMenu> 
        
                                            <ContextMenu Name="MenuItemMessages">  
        
                                                <MenuItem Name="MenuItemMessagesClear" Click="MenuItemMessagesClear_Click" Header="Temizle"></MenuItem> 
        
                                                <MenuItem Name="MenuItemMessagesSave" Click="MenuItemMessagesSave_Click"  Header="Kaydet"></MenuItem> 
        
                                            </ContextMenu> 
        
                                        </TextBox.ContextMenu> 
        
                                    </TextBox> 
        
                                </Telerik:RadDocumentPane> 
        
                            </Telerik:RadPaneGroup> 
        
                        </Telerik:RadSplitContainer> 
        
                        <Telerik:RadDocking.DocumentHost> 
        
                            <Telerik:RadSplitContainer> 
        
                                <Telerik:RadPaneGroup Name="documentPaneGroup" SelectionChanged="documentPaneGroup_SelectionChanged">  
        
                                </Telerik:RadPaneGroup> 
        
                            </Telerik:RadSplitContainer> 
        
                        </Telerik:RadDocking.DocumentHost> 
        
                    </Telerik:RadDocking>

Here's the code to add a pane:

    
            public RadPane AddPane(UserControl control, bool canBeClosed = true)  
        
                    {  
        
                        RadPane contentPane = new RadPane();  
        
                        contentPane.Content = control;  
        
                        //contentPane.Header = control.Title;  
        
                        contentPane.IsSelected = true;  
        
                        contentPane.CanFloat = false;  
        
                        contentPane.CanUserPin = false;  
        
                        documentPaneGroup.AddItem(contentPane, Telerik.Windows.Controls.Docking.DockPosition.Center);  
        
                        return contentPane;  
        
                    }

Does this mean a control embedded in a RadPane loaded twice ?

3 Answers, 1 is accepted

answered on 16 Dec 2009, 04:04 PM

Hello Dogu,

The Loaded event of a visual object is called as many times as it enters the VisualTree. As the Docking control is moving the panes around it attaches and detaches them from the Visual tree so the Loaded event is called multiple times and this is expected. If you need the loaded event to do some initializations you could use a flag and to do your initializations only if the flag is not raised and to rise the flag the first time you hit the Loaded event.

Hope this helps.

All the best,
Miroslav Nedyalkov
the Telerik team

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