How to obtain count of displayed checkboxes...

Question

OK, I give up. I checked the manuals, the forum, done a number of tests, and can not find the answer...
I have a page that lists parents, and for those parents whose account is locked a checkbox will appear next to their name, allowing that parent to be selected so their account can be unlocked.
SELECT
CASE
WHEN acct_locked = 'Y' THEN apex_item.checkbox(3,p_id)
ELSE ' '
END UNLOCK,
p_id "View Stu",
p_id "User ID",
p_password "Pswd",
CASE
WHEN acct_locked = 'Y' THEN 'YES'
WHEN acct_locked = 'N' THEN 'NO'
ELSE NVL(acct_locked,' ')
END "Acct Locked",
I have a button at the bottom of the region that says 'Unlock Selected Users'.
I only want to display the button if there are locked users (checkboxes displayed on the screen).
I know I can use 'FOR i in 1..APEX_APPLICATION.G_F03.count' to see how many checkboxes have been selected. Is there a way to check a field to see how many checkboxes are displayed?
That way if the displayed checkboxes count is > zero I can display the button that says 'Unlock Selected Users' - on other words, only display the button if there are users who need to be unlocked.
Any other solutions would be greatly appreciated...
TIA

Answer 1

Andy,
I did not manually create the checkboxes, they were automatically created by APEX in the following CASE statement in my SELECT for the region:
    CASE
    WHEN acct_locked = 'Y' THEN apex_item.checkbox(3,p_id)
    ELSE ' '
    END UNLOCK,
I do not know what name/ID that APEX assigns to the checkboxes, only that to reference the value in the checkboxes on my Processes I have to use the following format:
    APEX_APPLICATION.G_F03(i)
I did a View Page Source in my browser, and it appears that APEX uses javascript to construct the region portion of the page. There isn't anything that is identifiable to me.
<script type="text/javascript">
<!--
var rowStyle = new Array(1);
var rowActive = new Array(1);
var rowStyleHover = new Array(1);
rowStyle[1]='';
rowStyleHover[1]='';
rowActive[1]='N';
function row_mouse_over1224265375934797690(rowNode,currentRowNum) {
rowActive = 'Y';
for( var i = 0; i < rowNode.childNodes.length; i++ ) {
if (rowNode.childNodes.tagName=='TD') {
rowStyleHover[currentRowNum] = rowNode.childNodes[i].style.backgroundColor;
rowNode.childNodes[i].style.backgroundColor = '';
function row_mouse_out1224265375934797690(rowNode,currentRowNum) {
rowActive = 'N';
for( var i = 0; i < rowNode.childNodes.length; i++ ) {
if (rowNode.childNodes[i].tagName=='TD') {
rowNode.childNodes[i].style.backgroundColor = rowStyleHover[currentRowNum];
// -->
</script>