bueno..yo lo hago de esta manera;
-abri el tema a editar con el programa theme creator
-ve a la pestaña xml editor
-se desplega una ventana y veras estas lineas
<?xml version="1.0"?>
<!-- Created with Sony Ericsson Themes Creator -->
<Sony_Ericsson_theme version="4.7">
<Background Color="0x000000"/>
<Background_image Source="c01.png"/>
<Calendar_weekview_markings Color="0x60a0f0"/>
<Desktop Color="0x000000"/>
<Desktop_image Source="b01.png"/>
<Desktop_title_text Color="0xffffff"/>
<Highlight_text Color="0x60a0f0"/>
<Highlight Color="0x101010"/>
<Highlight_image Source="d02.png"/>
<Highlight_small_image Source="c03.png"/>
<Home_screen_text Color="0x000000"/>
<Home_screen Color="0x1d80a0"/>
<Home_screen_frame Color="0x000000"/>
<Home_screen_highlight_text Color="0x20fff0"/>
<Home_screen_highlight Color="0x000000"/>
<Home_screen_highlight_image Source="e05.png"/>
<Home_screen_highlight_small_image Source="e03.png"/>
<Home_screen_image Source="e01.png"/>
<Home_screen_scrollbar_background Color="0x000000"/>
<Home_screen_scrollbar_slider Color="0xffffff"/>
<Home_screen_tab_text Color="0x20fff0"/>
<Home_screen_tab Color="0x000000"/>
<Home_screen_tab_image Source="e04.png"/>
<Home_screen_tab_unselected Color="0x101010"/>
<Home_screen_tab_selected Color="0x000000"/>
<Home_screen_tab_selected_image Source="e06.png"/>
<Home_screen_tab_unselected_image Source="e07.png"/>
<Input_text Color="0x000000"/>
<Input_image Source="i01.png"/>
<Input_marked_text Color="0xffffff"/>
<Input_popup_text Color="0x000000"/>
<Input_popup Color="0x20fff0"/>
<Input_popup_frame Color="0x000000"/>
<Input_popup_highlight_text Color="0x60a0f0"/>
<Input_popup_highlight Color="0x000000"/>
<Input_popup_scrollbar_background Color="0x000000"/>
<Input_popup_scrollbar_slider Color="0xffffff"/>
<Input_small_image Source="i02.png"/>
<Morelist_text Color="0x000000"/>
<Morelist Color="0x1d80a0"/>
<Morelist_frame Color="0x000000"/>
<Morelist_highlight_text Color="0x20fff0"/>
<Morelist_highlight Color="0x000000"/>
<Morelist_highlight_image Source="e03.png"/>
<Morelist_image Source="f01.png"/>
<Morelist_scrollbar_background Color="0x000000"/>
<Morelist_scrollbar_slider Color="0xffffff"/>
<Popup Color="0x1d80a0"/>
<Popup_dim Color="0x000000"/>
<Popup_frame Color="0x000000"/>
<Popup_highlight_text Color="0x20fff0"/>
<Popup_highlight Color="0x000000"/>
<Popup_highlight_image Source="e03.png"/>
<Popup_image Source="e01.png"/>
<Popup_scrollbar_background Color="0x000000"/>
<Popup_scrollbar_slider Color="0xffffff"/>
<Popup_text Color="0x000000"/>
<Popup_title_image Source="e02.png"/>
<Popup_title_text Color="0x20fff0"/>
<Progress_bar_outline Color="0x000000"/>
<Progress_bar_fill Color="0x20fff0"/>
<Progress_bar_slider Color="0x60a0f0"/>
<Scrollbar_background Color="0x000000"/>
<Scrollbar_slider Color="0xffffff"/>
<Softkey_text_left Color="0xffffff"/>
<Softkey_text_left_pressed Color="0x000000"/>
<Softkey_text_middle Color="0xffffff"/>
<Softkey_text_middle_pressed Color="0x000000"/>
<Softkey_text_right Color="0xffffff"/>
<Softkey_text_right_pressed Color="0x000000"/>
<Standby_image Source="a01.swf"/>
<Standby_operatorname_text Color="0xffffff"/>
<Standby_operatorname_outline Color="0x000000"/>
<Standby_softkey_image Source="a02.png"/>
<Standby_statusbar_image Source="a03.png"/>
<Standby_time Color="0xffffff"/>
<Standby_time_outline Color="0x000000"/>
<Statusbar_clock Color="0xffffff"/>
<Tab_text Color="0x60a0f0"/>
<Tab Color="0x000000"/>
<Tab_image Source="d01.png"/>
<Tab_unselected Color="0x101010"/>
<Tab_selected Color="0x000000"/>
<Tab_selected_image Source="d03.png"/>
<Tab_unselected_image Source="d04.png"/>
<Text Color="0xffffff"/>
<Title_image Source="c04.png"/>
<Title_small_image Source="c02.png"/>
<Title_text Color="0xffffff"/>
<Volume_staples Color="0x20fff0"/>
<Wapbrowser_underline Color="0x60a0f0"/>
<Wapbrowser_tableborder Color="0x60a0f0"/>
<Media_multiletter_search Color="0xa0a0a0"/>
<Media_background_search Color="0x606060"/>
<Media_icon Color="0xa0a0a0"/>
<Media_highlight_icon Color="0xffffff"/>
<Media_text Color="0xa0a0a0"/>
<Media_text_background Color="0x000000"/>
<Media_highlight_text Color="0xffffff"/>
<Media_highlight_text_background Color="0x000000"/>
<Media_line Color="0xffffff"/>
<Media_walkman_line Color="0x457d36"/>
<Media_particle Color="0xffffff"/>
<Media_walkman_particle Color="0xffffff"/>
<Media_history_bar Color="0x000000"/>
<Media_walkman_icon Color="0xffffff"/>
<Media_walkman_highlight Color="0xffffff"/>
<Media_progressbar_background Color="0xa0a0a0"/>
<Media_progressbar Color="0xffffff"/>
<Media_progressbar_buffer Color="0xffffff"/>
<Media_wheel_icon Color="0xffffff"/>
<Media_walkman_state_icon Color="0xffffff"/>
<Media_walkman_mode_icon Color="0xffffff"/>
<Desktop_style Type="File" Source="lined green k1"
</Sony_Ericsson_theme>
agrega en la ultima parte la linea q dijo H3ro fijate esta con letra oscura te puse un ejemplo con el nombre de un menu flash q bajaste el de lined green k1 solo cambia el nombre del menu q queres ejemplo:<Desktop_style Type="File" Source="aqui el nombre del menu"
luego click en OK y guardas los cambios click en save o (ctrl+s) y listo!
si no tenes el programa descarga de este link
ThemesCreator-v4.16.2.6.exe - 4shared.com - online file sharing and storage - download (http://www.4shared.com/file/GkVcX6iN/ThemesCreator-v41626.html)
saludos jjc524