.NET MAUI set focus to control into ControlTemplate - xaml

Question

I have this ControlTemplate (two controls on it):
<Style TargetType="controls:QuickSearch">
<Setter Property="ControlTemplate">
<Setter.Value>
<ControlTemplate>
<VerticalStackLayout HorizontalOptions="Fill">
<Entry
x:Name="EntryFilter"
Text="{TemplateBinding Filter}"
Completed="Entry_Completed"
behaviors:SetFocusOnEntryCompletedBehavior.NextElement="{x:Reference LstResults}"
Focused="Entry_Focused"
ClearButtonVisibility="WhileEditing"
Placeholder="{TemplateBinding PlaceHolder,Mode=TwoWay}">
<Entry.Triggers>
<EventTrigger Event="Completed">
</EventTrigger>
</Entry.Triggers>
</Entry>
<ListView
x:Name="LstResults"
Margin="5"
Background="{DynamicResource PN_ColorFondoPrimario}"
ZIndex="999"
ItemsSource="{TemplateBinding Results}"
SelectionMode="Single"
SelectedItem="{TemplateBinding SelectedItem,Mode=TwoWay}"
IsVisible="{TemplateBinding PerforminigSearch}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Label Text="{Binding DisplayField}" Margin="9"/>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.Triggers>
</ListView.Triggers>
</ListView>
</VerticalStackLayout>
<-- MAUI don't allow to set triggers here -->
<ControlTemplate.Triggers>
</ControlTemplate.Triggers>
<-- ======================================= -->
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
And I want to set the focus into EntryFilter when my control template receives focus. I was trying with a trigger, but MAUI doesn't allow me to put some triggers into the <ControlTemplate> tag.
<Style TargetType="controls:QuickSearch">
<Style.Triggers>
<Trigger Property="IsFocused" Value="True">
<Setter TargetName="EntryFilter" Property="IsFocused" Value="True"/>
</Trigger>
</Style.Triggers>
. . . .
. . . .
</Style>
I tried with MAUI toolkit, but where should I put SetFocusOnEntryCompletedBehavior?