How to uncheck buttons?

[svrsvr]

......
out "some thing"
myfunction()
......
------------------------------------
function flag hDlg

bi=id(1010 hDlg)
code 1：
if((flag)&1)
out "pressed";but+ bi
else
out "released";but- bi

code 2：
if((flag)&1)
out "pressed";but+ bi
else
out "released";;but- bi
...
ret

code 2 is ok,but code1 can't work and print a debug text which never should print here,that text I put it before the function......fainting~~~