Probably Behaviors not working in Simpleshell

[KannanKrish]

My xaml markup code is (code have the behavior)

<simpleShell:SimpleShell.Content>
	<Grid RowDefinitions="50, *">
		...
		<Grid x:Name="MenuContent"
			  Grid.Row="0"
			  Grid.RowSpan="2"
			  IsVisible="False">
			...
				<Grid.Behaviors>
					<IsVisibleAnimBehavior x:Name="IsVisibleAnimBehavior" ChangeVisibility="True" />
					<PositionAnimBehavior AnimationDuration="300" Easing="{x:Static Easing.BounceOut}" StartPositionX="-400" />
				</Grid.Behaviors>

			</Grid>
		</Grid>
	</Grid>
</simpleShell:SimpleShell.Content>

IsVisibleAnimBehavior behavior is responsible for triggering the animation whenever the visibility changes.

When app runs, I got exception like

System.ArgumentException: 'Unable to find IAnimationManager for 'Microsoft.Maui.Controls.Grid'. (Parameter 'animatable')'

The behavior works fine with normal Content Page.