I just wanted to share my code that I use to spell check all the controls on one page.  I just drag and drop the spell checking component on the page.  I put on a button in the Click Event to call my javascript function checkspelling.  Thats all I do.  Here is the code:

function checkSpelling() {
    var spellid = GetSpellChecker();
    if (spellid) {
        var len = 1;
        len = spellid.indexOf('_Data');
        spellid = Mid(spellid,0,len);
        var editor = ig_getWebControlById(spellid);
        if (editor == null) {
            alert('Spell Checker Component was not found!');
            return;
        }
        var str = '';
        var elem = document.getElementById('Form1').elements;
        for (var i = 0; i < elem.length; i++) {
            if (elem[i].type == 'text' || elem[i].type == 'textarea') {
                editor.checkTextComponent(elem[i].name);
            }
        }
    }
}

function GetSpellChecker() {
    var str = '';
    var obj;
    var elem = document.getElementById('Form1').elements;
    for (var i = 0; i < elem.length; i++) {
        str = elem[i].name + '';
        if (str.indexOf('_WebSpellChecker') >= 1) {
            return elem[i].name;
        }
    }
    return null;
}