WPF---＞自定义控件中添加按钮，TextBox添加Button为例

    <Style x:Key="SearchInputBox" TargetType="{x:Type TextBox}">
        <Setter Property="Height" Value="30"/>
        <Setter Property="Width" Value="150"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBox}">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="4*"/>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <TextBox  Height="30" Whith="150" Grid.Column="0" Grid.ColumnSpan="2"/>
                        <Button Height="30" Whith="30" Grid.Column="1"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>