Reuseable help Button and help popup

Question

Hi,

I have about 30 views and corresponding VMs in my application. I have a help button next to most user controls which gives some description of what the field is for. When the user clicks on that button, a popup opens and gives the description. What will be the best way to make this functionality reusable in all the views? I have created a template for the help button and the help popup but can I go further than this? Thanks.

<Style x:Key="HelpButton" TargetType="{x:Type Button}" >
                        <Setter Property="Template">
                            <Setter.Value>
                               <ControlTemplate TargetType="{x:Type Button}">

                                   <Ellipse Focusable="True" Height="16" Width="16">
                                        <Ellipse.Fill>
                                            <ImageBrush ImageSource="../../Resources/Icons/Help.png" />
                                        </Ellipse.Fill>
                                    </Ellipse>                                            

                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>