.NET MAUI Expander Configuration

The purpose of this help article is to show you how to configure the Telerik .NET MAUI Expander control.

Collapsed/Expanded States

RadExpander provides an expandable container which can hold any content. You can show or hide this content by interacting with the Header of the control. The default state of RadExpander is collapsed.

You can use IsExpanded boolean property to switch the current state of the control.

Expander Header

You can either apply HeaderText property or use the ExpanderHeader content control which provides a set of useful properties for customizing the way the header looks. For more details refer to ExpanderHeader control topic.

<telerik:RadExpander x:Name="expander"
                     HeaderText="Read more"
                     HeaderLocation="Bottom">
    <telerik:RadExpander.Content>
        <VerticalStackLayout Margin="10">
            <Label Text="You could place the Header at the top or at the bottom of the expandable container." HeightRequest="50"/>
        </VerticalStackLayout>
    </telerik:RadExpander.Content>
</telerik:RadExpander>

Animation While Expanding or Collapsing

To enable or disable the animation you need to use the IsAnimationEnabled property of RadExpander. By default, the Animation is enabled.

You can also customize the duration and easing (acceleration over time) through AnimationDuration(in ms) and AnimationEasing (of type Microsoft.Maui.Easing) properties.

Border Styling

You can apply BorderColor and BorderThickness properties of RadExpander to make it compatible with the design of your app.

ExpanderHeader also provides means for customizing its border, you can learn more about this in the ExpanderHeader: Border Styling article.

Check the example below on how the border settings can be defined:

<telerik:RadExpander x:Name="expander"
                     HeaderText="Read more"
                     BorderColor="LightBlue"
                     BorderThickness="2">
    <telerik:RadExpander.HeaderTextStyle>
        <Style TargetType="Label">
            <Setter Property="TextColor" Value="BlueViolet"/>
            <Setter Property="FontAttributes"  Value="Italic"/>
        </Style>
    </telerik:RadExpander.HeaderTextStyle>
    <telerik:RadExpander.Content>
        <VerticalStackLayout Margin="10">
            <Label Text="You could apply BorderColor and BorderThickness properties of RadExpander to make it consistent with the design of your app." HeightRequest="60"/>
        </VerticalStackLayout>
    </telerik:RadExpander.Content>
</telerik:RadExpander>

Header Text Styling

To customize the text inside the header you have to use the HeaderTextStyle property. If HeaderTextStyle is not set, the text inside is bold by default.

The following code shows how to declare the HeaderTextStyle property in the Expander:

<telerik:RadExpander.HeaderTextStyle>
    <Style TargetType="Label">
        <Setter Property="TextColor" Value="BlueViolet"/>
        <Setter Property="FontAttributes"  Value="Italic"/>
    </Style>
</telerik:RadExpander.HeaderTextStyle>

And the result:

See Also

• Getting Started