I achived the same functionility for bubble chart by changing the control template as show...but not able to fidn the solution for 100 stackbar series
<system:String x:Key="BubbleData">M70.5,140.5 L70.6,140.5 70.6,140.6 70.5,140.6 z M140.5,70.5 L140.6,70.5 140.6,70.6 140.5,70.6 z M0.5,70.5 L0.6,70.5 0.6,70.6 0.5,70.6 z M70.5,5 C91.4,5 110.1,14.8 122.07,30.1 123.5,32 107.9,60.5 79.7,73.5 47.7,88.3 5,80.8 5,70.5 5,34.3 34.3,5 70.5,5 z M70.5,0.5 L70.6,0.5 70.6,0.6 70.5,0.6 z</system:String>
<LinearGradientBrush x:Key="BubbleMaskBrush" EndPoint="0,0.7" StartPoint="0,0" MappingMode="RelativeToBoundingBox">
<GradientStop Color="#7fffffff"/>
<GradientStop Color="Transparent" Offset="1"/>
</LinearGradientBrush>
<LinearGradientBrush x:Key="BubbleMaskStroke" EndPoint="1,0.4" StartPoint="0,0.6">
<GradientStop Color="#66FFFFFF" Offset="0.05"/>
<GradientStop Color="Transparent" Offset="1"/>
<GradientStop Color="Transparent" Offset="0.002"/>
<GradientStop Color="Transparent" Offset="0.431"/>
</LinearGradientBrush>
<system:Double x:Key="BubbleMaskStrokeThickness">1</system:Double>
<Style x:Key="CustomBubble"
TargetType="telerik:Bubble">
<Setter Property="Template" >
<Setter.Value>
<ControlTemplate TargetType="telerik:Bubble">
<Canvas RenderTransformOrigin="{TemplateBinding RelativeCenterPoint}" x:Name="PART_MainContainer">
<Path x:Name="PART_BubbleElement"
Data="{TemplateBinding ItemGeometry}"
Style="{TemplateBinding ItemStyle}" />
<Path Stretch="Fill"
Canvas.Left="{TemplateBinding Left}"
Canvas.Top="{TemplateBinding Top}"
Width="{TemplateBinding Diameter}"
Height="{TemplateBinding Diameter}"
Data="{StaticResource BubbleData}"
Fill="{StaticResource BubbleMaskBrush}"
Stroke="{StaticResource BubbleMaskStroke}"
StrokeThickness="{StaticResource BubbleMaskStrokeThickness}" />
<Ellipse Width="25" Height="25" x:Name="RectSV"
Canvas.Left="{TemplateBinding Left}"
Canvas.Top="{TemplateBinding Top}" >
<Ellipse.Fill>
<ImageBrush x:Name="BblImageSV" ImageSource="../Images/ico_specialityvisit2.png" ></ImageBrush>
</Ellipse.Fill>
</Ellipse>
</Canvas>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>