How should I set a searchbox in commandbar item?

To set a search box in a CommandBar item, you can use the AppBarTextBox control in Universal Windows Platform (UWP) apps. Here's an example of how you can add a search box to a CommandBar item:

xamlCopy code
<CommandBar>

    <AppBarButton Icon="Search">

        <AppBarButton.Flyout>

            <Flyout Placement="Bottom">

                <Flyout.FlyoutPresenterStyle>

                    <Style TargetType="FlyoutPresenter">

                        <Setter Property="Background" Value="White" />

                    </Style>

                </Flyout.FlyoutPresenterStyle>

                <StackPanel>

                    <TextBlock Text="Search" Margin="8" FontWeight="Bold" />

                    <TextBox PlaceholderText="Enter your search query" Margin="8" />

                </StackPanel>

            </Flyout>

        </AppBarButton.Flyout>

    </AppBarButton>

</CommandBar>

In the above example:

1. We use the CommandBar control to represent the command bar UI element.
2. Inside the CommandBar, we define an AppBarButton with the "Search" icon.
3. We set the Flyout property of the AppBarButton to display a flyout when clicked.
4. Inside the Flyout, we use a FlyoutPresenterStyle to customize the appearance of the flyout.
5. Within the Flyout, we add a StackPanel containing a TextBlock for the search title and a TextBox for entering the search query.

You can customize the appearance of the search box and the behavior of the search functionality according to your requirements.

Note that this example is for UWP XAML. If you are working with a different UI framework or platform, the approach may vary.