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//声明实例变量long il_handle
//tv_1 selectionchanged事件:
il_handle = newhandle
//cb_1 clecked事件
long ll_handle, ll_level, ll_leveltmp
treeviewitem ltvi_1
ll_handle = il_handle
tv_1.getitem(ll_handle,ltvi_1)
ll_level = ltvi_1.level
ll_leveltmp = ll_level + 1
tv_1.expandall(ll_handle)
do while ll_leveltmp > ll_level
ll_handle = tv_1.finditem(NextVisibleTreeItem! ,ll_handle)
if ll_handle < 0 then exit
tv_1.getitem(ll_handle,ltvi_1)
ll_leveltmp = ltvi_1.level
if ll_leveltmp > ll_level then messagebox( '', ltvi_1.label )
tv_1.expandall(ll_handle)
loop