<Window x:Class="WpfApplication1.Window1"

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

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

    Title="Window1" Height="" Width="" Loaded="Window_Loaded">

    <Window.Resources>

        <Style x:Key="LabelTemp" TargetType="Label">

            <Setter Property="Template">

                <Setter.Value>

                    <ControlTemplate TargetType="Label">

                        <Grid >

                            <TextBox x:Name="tb" Text="{TemplateBinding Content}" Visibility="Hidden"  Width="" Height=""

                                      HorizontalAlignment="Center" VerticalAlignment="Top"  FontSize=""></TextBox>

                            <Label x:Name="labReal" Content="{TemplateBinding Content}" Width="" Height=""

                                  HorizontalAlignment="Center" VerticalAlignment="Top"  FontSize="" ></Label>

                        </Grid>

                        <ControlTemplate.Triggers>

                            <Trigger Property="IsMouseOver" Value="true">

                                <Setter TargetName="tb" Property="Visibility" Value="Visible">

                                </Setter>

                                <Setter TargetName="labReal" Property="Visibility" Value="Hidden"></Setter>

                            </Trigger>

                            <Trigger Property="IsMouseOver" Value="false">

                                <Setter TargetName="labReal" Property="Content" Value="{Binding ElementName=tb,Path=Text}"></Setter>

                            </Trigger>

                        </ControlTemplate.Triggers>

                    </ControlTemplate>

                </Setter.Value>

            </Setter>

        </Style>

    </Window.Resources>

    <Grid>

        <Grid.ColumnDefinitions>

            <ColumnDefinition Width="104*" />

            <ColumnDefinition Width="174*" />

        </Grid.ColumnDefinitions>

        <Label Name="lab" Style="{StaticResource LabelTemp}" VerticalAlignment="Top">Demo Label

        </Label>

    </Grid>

</Window>