Why a WindowsFormsHost Control loads first than the rest of controls in a TabItem?

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C#

WPF

WinForms

Hi!

I´m developing a WPF application and I´ve next problem.
In my app I have a TabControl with some TabItems. In each TabItem I have the estructure below:

<TabItem Selector.Selected="TabItemFiles_Selected" Style="{StaticResource TabItemHorizontal}">
                   <TabItem.Header>
                       <StackPanel>
                           <Image Width="50" Height="50"                             Source="Images/Files.png"/>
                       </StackPanel>
                   </TabItem.Header>
                   <tabItemControls:TabFiles x:Name="Files" MinHeight="{x:Static constantes:Constantes.AltoResolucionPantalla}" Margin="5,10,5,5"/>
               </TabItem>

Inside of this TabItemControl:TabFiles, I´ve the code below in a Grid:

<WindowsFormsHost Grid.Column="2">
   <wf:Panel x:Name="PrevisualizadorTrabajos">
   </wf:Panel>
</WindowsFormsHost>

I fill the content of PrevisualizadorTrabajos Panel at TabItemControl:TabFiles Loaded event.

The problem comes when this TabItemControl is shown for the first time. The content of the WindowsFormsHost control is shown firstly than other components on this TabItemControl and it creates an unpleasant visual effect.

How can I fix it?

Thank you very much.