How to use different ItemsControl.ItemContainerStyle for different ItemsPanelTemplate - wpf

Question

I have an ItemsControl which uses different ItemsPanelTemplate based on certain condition. I want to have different ItemContainerStyle for each ItemsPanelTemplate (in fact, I want ItemsContainerStyle for only one of the templates). How can I achieve that? Here is the code I am using:
<UserControl.Resources>
<ItemsPanelTemplate x:Key="UGridItemsPanelTemplate">
<UniformGrid Name="MyUGrid" Columns="{Binding Columns}" Rows="{Binding Rows}"/>
</ItemsPanelTemplate>
<ItemsPanelTemplate x:Key="GridItemsPanelTemplate">
<Grid Name="MyGrid" Loaded="MyGrid_Loaded"/>
</ItemsPanelTemplate>
</UserControl.Resources>
<Grid>
<!--ItemList has 1000+ items if IsMap is FALSE; using ItemsConatinerStyle in this case slows the UI down-->
<ItemsControl Name="MyPresenter" ItemsSource="{Binding ItemList}" Tag="{Binding IsMap}">
<ItemsControl.Style>
<Style TargetType="{x:Type ItemsControl}">
<Setter Property="ItemsPanel" Value="{StaticResource UGridItemsPanelTemplate}"/>
<Style.Triggers>
<Trigger Property="Tag" Value="TRUE">
<!--I want to use ItemContainerStyle only for this template-->
<Setter Property="ItemsPanel" Value="{StaticResource GridItemsPanelTemplate}"/>
</Trigger>
</Style.Triggers>
</Style>
</ItemsControl.Style>
<!--Use this style only if IsMap is TRUE-->
<ItemsControl.ItemContainerStyle>
<Style>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ContentControl}">
<ContentPresenter/>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Grid.Row" Value="{Binding GridRow}"/>
<Setter Property="Grid.Column" Value="{Binding GridColumn}"/>
</Style>
</ItemsControl.ItemContainerStyle>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Border x:Name="Border1" Background="{Binding BorderVisible}"
BorderThickness="1" Padding="{Binding PaddingVal}">
<Button Name="ItemButton" Content="{Binding Label}" IsEnabled="{Binding IsButtonEnabled}" CommandParameter="{Binding}"/>
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</UserControl>
Thanks,
RDV

Answer 1

I found a way, When IsMap is TRUE, set ItemsContainerStyle along with ItemsPanel. Updated code is posted below:
<UserControl.Resources>
<ItemsPanelTemplate x:Key="UGridItemsPanelTemplate">
<UniformGrid Name="MyUGrid" Columns="{Binding Columns}" Rows="{Binding Rows}"/>
</ItemsPanelTemplate>
<ItemsPanelTemplate x:Key="GridItemsPanelTemplate">
<Grid Name="MyGrid" Loaded="MyGrid_Loaded"/>
</ItemsPanelTemplate>
<Style x:Key="ClusterGridContainerStyle">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ContentControl}">
<ContentPresenter/>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Grid.Row" Value="{Binding UnitGridRow}"/>
<Setter Property="Grid.Column" Value="{Binding UnitGridColumn}"/>
</Style>
</UserControl.Resources>
<Grid>
<!--ItemList has 1000+ items if IsMap is FALSE-->
<ItemsControl Name="MyPresenter" ItemsSource="{Binding ItemList}" Tag="{Binding IsMap}">
<ItemsControl.Style>
<Style TargetType="{x:Type ItemsControl}">
<Setter Property="ItemsPanel" Value="{StaticResource UGridItemsPanelTemplate}"/>
<Style.Triggers>
<Trigger Property="Tag" Value="TRUE">
<!--I want to use ItemContainerStyle only for this template-->
<Setter Property="ItemsPanel" Value="{StaticResource GridItemsPanelTemplate}"/>
<Setter Property="ItemContainerStyle" Value="{StaticResource ClusterGridContainerStyle}"/>
</Trigger>
</Style.Triggers>
</Style>
</ItemsControl.Style>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Border x:Name="Border1" Background="{Binding BorderVisible}"
BorderThickness="1" Padding="{Binding PaddingVal}">
<Button Name="ItemButton" Content="{Binding Label}" IsEnabled="{Binding IsButtonEnabled}" CommandParameter="{Binding}"/>
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</UserControl>