newtonform

Hi,I have a question for button listener.
for example EQUI_Inventory.xml ,The Destroy button:
<Button item="IW_Destroy">
<ScreenID>IW_Destroy</ScreenID>
<Font>2</Font>
<RelativePosition>true</RelativePosition>
<Location>
<X>202</X>
<Y>402</Y>
</Location>
<Size>
<CX>50</CX>
<CY>20</CY>
</Size>
<Style_Transparent>false</Style_Transparent>
<!--<TooltipReference/>-->
<Style_Checkbox>false</Style_Checkbox>
<!--<RadioGroup/>-->
<Text>Destroy</Text>
<TextColor>
<R>255</R>
<G>255</G>
<B>255</B>
</TextColor>
<ButtonDrawTemplate>
<Normal>A_BtnNormal</Normal>
<Pressed>A_BtnPressed</Pressed>
<Flyby>A_BtnFlyby</Flyby>
<Disabled>A_BtnDisabled</Disabled>
<PressedFlyby>A_BtnPressedFlyby</PressedFlyby>
</ButtonDrawTemplate>
</Button>

I cannt see EQTYPE or function for"IW_Destroy" ,I dont know how it to work, thanks!