.net - WPF Button Images Show at Design Time but Not Run Time -

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i have 2 images stored in resources folder have build action set resources , copy output directory set not copy. images "font.png" , "open.png". when view designer, images appear in buttons them too, however; when run application buttons empty. below xaml, doing wrong?

<window x:class="preferences"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:se="clr-namespace:therandomizerwpf.markupextensions"         xmlns:res ="clr-namespace:therandomizerwpf.my"         xmlns:clr="clr-namespace:system;assembly=mscorlib"         title="preferences"          icon="the randomizer.ico"         height="227.509"          width="453.736"         windowstyle="threedborderwindow"         resizemode="noresize"         style="{dynamicresource resourcekey=windowstyle}" >     <window.resources>         <image x:key="font" source="pack://application,,,resources/resources/font.png" />         <image x:key="open" source="pack://application,,,resources/resources/open.png" />     </window.resources>     <stackpanel orientation="vertical">         <dockpanel margin="3" style="{dynamicresource resourcekey=contentpanel}">             <checkbox name="chkautoupdate" content="auto update" margin="6,3,3,3" verticalalignment="center" />         </dockpanel>         <dockpanel margin="3" style="{dynamicresource resourcekey=contentpanel}">             <label name="lblresultfont" verticalcontentalignment="center" width="160" margin="3" content="default result font" dockpanel.dock="left" />                         <button name="btnresultfont" margin="3" height="22" width="22" dockpanel.dock="right" content="{staticresource resourcekey=font}" />             <textbox name="txtresultfont" margin="3" height="21" isreadonly="true" dockpanel.dock="left" />         </dockpanel>         <dockpanel margin="3,3,3,0" style="{dynamicresource resourcekey=contentpanel}">             <label name="lbltempdirectory" verticalcontentalignment="center" width="160" margin="3" content="temporary directory" dockpanel.dock="left" />             <button name="btntempdirectory" margin="3" width="22" height="22" dockpanel.dock="right" content="{staticresource resourcekey=open}" />             <textbox name="txttempdirectory" margin="3" height="22" isreadonly="true" dockpanel.dock="left" />         </dockpanel>         <dockpanel margin="3,0,3,0" style="{dynamicresource resourcekey=contentpanel}">             <label name="lblcustomgrammardirectory" verticalcontentalignment="center" width="160" margin="3" content="custom grammar directory" dockpanel.dock="left" />             <button name="btncustomgrammardirectory" margin="3" width="22" height="22" dockpanel.dock="right" content="{staticresource resourcekey=open}" />             <textbox name="txtcustomgrammardirectory" margin="3" height="21" isreadonly="true" dockpanel.dock="left" />         </dockpanel>         <dockpanel margin="3,0,3,3" style="{dynamicresource resourcekey=contentpanel}">             <label name="lblthemedirectory" verticalcontentalignment="center" width="160" margin="3" content="theme directory" dockpanel.dock="left" />             <button name="btnthemedirectory" margin="3" width="22" height="22" dockpanel.dock="right" content="{staticresource resourcekey=open}" />             <textbox name="txtthemedirectory" margin="3" height="21" isreadonly="true" dockpanel.dock="left" />         </dockpanel>         <dockpanel margin="3" lastchildfill="false">             <button name="btnok" style="{dynamicresource resourcekey=actionbutton}" dockpanel.dock="right" width="80" margin="3" content="_ok" isdefault="true" />             <button name="btncancel" style="{dynamicresource resourcekey=actionbutton}" dockpanel.dock="right" width="80" margin="3" content="_cancel" iscancel="true" />         </dockpanel>     </stackpanel> </window>

i think image source uri has incorrect format. should like

pack://application:,,,/subfolder/resourcefile.xaml

(note colon after "application")

what having 

source="subfolder/resourcefile.png"

which simpler, more readable, , works ;-)


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