Control not pulling up the Style mentioned in ResourceDictionary

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XAML

WPF

I've created a Resource dictionary for tool-tip styling, so that i can use in the application.
I've added the Resource dictionary in the same project.

it is as mentioned below

<Style x:Key="{x:Type ToolTip}"  TargetType="{x:Type ToolTip}">
	<Setter Property="OverridesDefaultStyle" Value="true"/>
	<Setter Property="VerticalOffset" Value="-2" />
	<Setter Property="HorizontalOffset" Value="20" />
	<Setter Property="Placement" Value="Bottom" />
	<Setter Property="Opacity" Value="1" />
	<Setter Property="FontFamily" Value="Arial"/>
	<Setter Property="Template">
		<Setter.Value>
			<ControlTemplate TargetType="{x:Type ToolTip}">
				<Grid Name="Border" removed="Transparent" Width="{TemplateBinding Width}" Height="Auto"  MinHeight="30">
					<Rectangle RadiusX="3" RadiusY="3"  Stroke="#FF1E86C1" Opacity="1" Margin="2,2,2,2">
						<Rectangle.Fill>
							<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
								<GradientStop Color="#FFFBF2C5" Offset="0.004"/>
								<GradientStop Color="#FFFFD200" Offset="1"/>
							</LinearGradientBrush>
						</Rectangle.Fill>
						<Rectangle.BitmapEffect>
							<DropShadowBitmapEffect ShadowDepth="2" Opacity=".6"  Softness="0.2"/>
						</Rectangle.BitmapEffect>			
					</Rectangle>						
					<ContentPresenter Margin="10,0,10,0" HorizontalAlignment="Center" VerticalAlignment="Center" TextBlock.Foreground="Black" TextBlock.FontSize="11"/>
					<TextBlock Margin="10,0,10,0" HorizontalAlignment="Center" VerticalAlignment="Center" TextWrapping="Wrap" Text="{Binding ToolTip.Content}" />
				</Grid>
			</ControlTemplate>
		</Setter.Value>
	</Setter>
        <Setter Property="FontFamily" Value="Arial"></Setter>
</Style>

And in app.xaml file of the project i'm using following codes:
(My Resources are in the Solution folder Named "Controls" in the same project)

<Application.Resources>
         
    	<ResourceDictionary>
    		<ResourceDictionary.MergedDictionaries>
                   <ResourceDictionary Source="Controls\ToolTip.xaml"/>
    		</ResourceDictionary.MergedDictionaries>    		
    	</ResourceDictionary>
         
    </Application.Resources>

Kindly suggest. !!