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Updated the README.md file #1

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50 changes: 50 additions & 0 deletions README.md
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**[View document in Syncfusion Xamarin Knowledge base](https://www.syncfusion.com/kb/12143/how-to-work-with-listview-sflistview-and-expander-sfexpander-in-xamarin-forms)**

## Sample

```xaml
<StackLayout>
<expander:SfExpander DynamicSizeMode="Content" HeaderIconPosition="End" IconColor="WhiteSmoke" HeaderBackgroundColor="#03506f" >
<expander:SfExpander.Header>
<Grid HeightRequest="50">
<Label Text="InBox" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand"/>
</Grid>
</expander:SfExpander.Header>
<expander:SfExpander.Content>
<extListView:ExtendedListView x:Name="listView" ItemsSource="{Binding InboxInfo}" ItemSpacing="1" ItemSize="70">
<extListView:ExtendedListView.ItemTemplate>
<DataTemplate>
<code>
. . .
. . .
<code>
</DataTemplate>
</extListView:ExtendedListView.ItemTemplate>
</extListView:ExtendedListView>
</expander:SfExpander.Content>
</expander:SfExpander>
</StackLayout>

C#:
public class ExtendedListView : SfListView
{
VisualContainer container;

public ExtendedListView()
{
container = this.GetVisualContainer();
container.PropertyChanged += Container_PropertyChanged;
}

private void Container_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
Device.BeginInvokeOnMainThread(async() =>
{
var extent = (double)container.GetType().GetRuntimeProperties().FirstOrDefault(container => container.Name == "TotalExtent").GetValue(container);
await Task.Delay(250);

if (e.PropertyName == "Height")
this.HeightRequest = extent;
});
}
}
```