Item mix shortcut icon

[joemarzzz]

How to put an icon on the white square? its item mix shortcut.
I already have its dds file. Located at textures/gui.

[MentaL]

[acertung]

up up

[looklike]

<CONTROL Local="Common" Id="ITEMMIX_SHORTCUT_BUTTON">
<WINDOW_POS X="502" Y="538" W="35" H="59" />
</CONTROL>
<CONTROL Local="Common" Id="ITEMMIX_SHORTCUT_BUTTON_IMAGE">
<WINDOW_POS X="0" Y="0" W="35" H="35" />
<TEXTURE SizeX="256" SizeY="128">item_mix_shortcut.dds</TEXTURE>
<TEXTURE_POS X="183" Y="0" W="35" H="35" />
</CONTROL>