button-bg.gif - x-grid.css, x-layout.css - not used, deleted
button-bg-disabled.gif - x-grid.css - not used, deleted
content-grid-header-bg_1.gif - x-grid.css
content-grid-header-bg_2.gif - x-grid.css

content-bottommenu-ico.gif - global.gridfilterslayout.css, x-actions.css
x-grid-header-bg-sprite.gif - x-grid.css
x-grid-sorting-sprite.gif - x-grid.css