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I have a User Control like this: <UserControl x:Class="MySample.customtextbox" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="20" d:DesignWidth="300"> <Grid> <TextBox x:Name="Ytextbox" Background="Yellow"/> </Grid> And I use this control in a window and set tab orders...but when my window is loaded, the tab order is not working correctly!!! my window code: <Window xmlns:my="clr-namespace:MySample" x:Class="MySample.window" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="window" Height="300" Width="600"> <Grid> <Grid.RowDefinitions> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition></ColumnDefinition> <ColumnDefinition></ColumnDefinition> <ColumnDefinition></ColumnDefinition> <ColumnDefinition></ColumnDefinition> </Grid.ColumnDefinitions> <my:customtextbox Grid.Column="1" KeyboardNavigation.TabIndex="0" InfoText="{Binding msg}" Height="20"/> <TextBox Grid.Column="3" KeyboardNavigation.TabIndex="1" Text="{Binding msg}" Height="20" Background="Gold"></TextBox> <my:customtextbox Grid.Row="1" Grid.Column="1" KeyboardNavigation.TabIndex="2" InfoText="{Binding msg}" Height="20"/> <TextBox Grid.Column="3" Grid.Row="1" Text="{Binding msg}" Height="20" KeyboardNavigation.TabIndex="3" Background="Gold"></Tex

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