windows phone 7 - WP7: Button Tap event does not fire each time -


i having issue button (having image background) not fire tap event each time tap on screen (sometimes fires every time, once in 3-4 times tap button on screen). project targeted wp7.1.

button defined in xaml as:

<button x:name="menu" tap="menu_tap" height="70" width="70" margin="0,0,0,0" horizontalalignment="center" padding="0" verticalalignment="center" style="{staticresource menuimagebuttonstyle}"></button>

style define menu background image:

<style x:key="menuimagebuttonstyle" targettype="button"> <setter property="template">     <setter.value>         <controltemplate targettype="button">             <grid>                 <image x:name="startbuttonimage" source="/images/menu_button.png" height="33" width="33" />                 <contentpresenter horizontalalignment="{templatebinding horizontalcontentalignment}"  verticalalignment="{templatebinding verticalcontentalignment}" content=""/>             </grid>         </controltemplate>     </setter.value> </setter> </style>

note i've experimented using tap, click , manipulationstarted events, no luck, events fire erratically. quite sure issue not tapping precision, make sure tap @ center of button. i've tested on nokia lumia 800.

entire project code available here: http://notecase.sourceforge.net/temp/wp7issue.zip

any idea, why so? tip fix this?


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