wpf - How to define a default tooltip style for all Controls -

i define style template when there validation errors , display first error message tooltip.

it works fine when targeting specific control datepicker in following xaml.

<style targettype="{x:type toolkit:datepicker}">     <style.triggers>         <trigger property="validation.haserror" value="true">             <setter property="tooltip"                      value="{binding relativesource={relativesource self},                     path=(validation.errors)[0].errorcontent}"/>         </trigger>     </style.triggers> </style> 

i cannot work control though, i.e. following doesn't give tooltip

<style targettype="{x:type toolkit:control}">     <style.triggers>         <trigger property="validation.haserror" value="true">             <setter property="tooltip"                      value="{binding relativesource={relativesource self},                     path=(validation.errors)[0].errorcontent}"/>         </trigger>     </style.triggers> </style> 

any idea?

i recommend create behavior one.

every control unique in , not reliable way attach specific behavior controls. , in fact, may end setting property on unwanted controls don't require validation.

behaviors clean , can assign them selected controls only. attached properties or master behavior can used assign behaviors child controls.

here codeproject article josh smith started on behaviors.