This option should contain buttons/control that you wich to insert into the container, the button names available is the same as in the theme_advanced_buttons_<1-3> option but two extra controls available when this layout option is used these are "mceEditor" and "mceElementpath". The <container> part of this option should be replaced with a name within the theme_advanced_containers list. This option can only be used when theme is set to advanced and when the theme_advanced_layout_manager option is set to the value of "RowLayout".
Example of usage of the theme_advanced_container_<container> option:
tinyMCE.init({
...
theme_advanced_container_somecontainer1 : "bold,italic",
theme_advanced_container_somecontainer2 : "strikethrough,cut"
});