If I try to select a class for my images in the TinyMCE Editor I’ve got only a "not set". I figured out, that i need to set the css_content attribute in TinyMCE plugin configuration. So this is my configuration:
&tinyPlugins=Plugins;text;style,layer,table,advhr,advimage,advlink,emotions,insertdatetime,preview,flash,searchreplace,print,contextmenu,paste,directionality,fullscreen,noneditable,nonbreaking,xhtmlxtras,visualchars,media &tinyButtons1=Button Row 1;text;newdocument,separator,bold,italic,underline,strikethrough,separator,justifyleft,justifycenter,justifyright,justifyfull,separator,styleselect,formatselect,fontselect,fontsizeselect &tinyButtons2=Button Row 2;text;cut,copy,paste,separator,search,replace,separator,pastetext,pasteword,selectall,separator,bullist,numlist,separator,outdent,indent,separator,undo,redo,separator,link,unlink,anchor,image,separator,cleanup,help,code,separator,insertdate,inserttime,preview,separator,forecolor,backcolor &tinyButtons3=Button Row 3;text;tablecontrols,separator,hr,removeformat,visualaid,separator,sub,sup,separator,charmap,emotions,iespell,flash,media,advhr,separator,print,separator,ltr,rtl,nonbreaking,separator,fullscreen &tinyButtons4=Button Row 4;text;insertlayer,moveforward,movebackward,absolute,separator,styleprops,visualchars,separator,cite,ins,del,abbr,acronym &disabledButtons=Disabled Buttons;text; &tinyFormats=Block Formats;text;p,div,address,pre,h1,h2,h3,h4,h5,h6 &entity_encoding=Entity Encoding;list;named,numeric,raw;named &entities=Entities;text; &tinyCompressor=Compressor;list;enabled,disabled;disabled &tinyPathOptions=Path Options;list;rootrelative,docrelative,fullpathurl;docrelative &tinyCleanup=Cleanup;list;enabled,disabled;enabled &webtheme=Web Theme;list;simple,advanced,full;simple &tinyResizing=Advanced Resizing;list;true,false;false &content_css="http://www.landpartie-seenplatte.de/assets/templates/default/style.css";;
But this has no effect on the class selection.