Change the build action to ‘Resource’.
Also your pack url is wrong. Either use:
Source="pack://application:,,,/Resource/UserCost2013Open16.png"
or simply
Source="/Resource/UserCost2013Open16.png"
Change the build action to ‘Resource’.
Also your pack url is wrong. Either use:
Source="pack://application:,,,/Resource/UserCost2013Open16.png"
or simply
Source="/Resource/UserCost2013Open16.png"