ios - UIButton setSelected: NO doesnt show default background image -

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i have custom uibutton 2 background images:

in default state: default.png  in selected state: selected.png

set in xib file.

this gets invoked on button touch down:

-(ibaction)numberselected:(id)sender{   nslog(@"button pressed %@",[sender currenttitle]);   uibutton* button = (uibutton*)sender;   button.selected = !button.selected;    [button release]; }

the wrong behavior this:

i press button, background image switches selected.png (correct), press again, , no backgorund image shown. press time, app crashes. knows help? lot in advance.

no need release button there. remove 

[button release];

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