allowed content : allow all class

Hi,

Using allowed content, if i try to allow strong with all class, set to:

config.allowedContent ='strong(*)';

It work i can add class to any strong, then i add it for em :

config.allowedContent ='strong(*) em(*)';

But then i can't use strong or em anymore .....

I test too :

config.allowedContent ='*(*)';

But same thing .... all is disallowed

What is want exactly is :

Allow specific tag with any class but no style + allow text-align on p only.

My complet config:

CKEDITOR.editorConfig = function( config ) {
	config.toolbar = [
		{ name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ], items: [ 'Bold', 'Italic', 'Underline', 'Strike', 'Subscript', 'Superscript', '-', 'RemoveFormat' ] },
		{ name: 'paragraph', groups: [ 'list', 'indent', 'blocks', 'align', 'bidi' ], items: [ 'NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', '-', 'Blockquote', 'CreateDiv', '-', 'JustifyLeft', 'JustifyCenter', 'JustifyRight', 'JustifyBlock', '-', 'BidiLtr', 'BidiRtl' ] },
		'/',
		{ name: 'document', groups: [ 'mode' ], items: [ 'Source' ] },
		{ name: 'tools', items: [ 'Maximize', 'ShowBlocks' ] },
		{ name: 'editing', groups: [ 'find', 'selection' ], items: [ 'Find', 'Replace', '-', 'SelectAll' ] },
		'/',
		{ name: 'links', items: [ 'Link', 'Unlink', 'Anchor' ] },
		{ name: 'insert', items: [ 'Image', 'Flash', 'Table', 'HorizontalRule', 'Smiley', 'SpecialChar', 'PageBreak', 'Iframe' ] },
	];
	config.allowedContent ='*(*)';
};