private void addStartTagVariable(String tagToAdd,ITextRegionCollection customTag, int index){
IFile f = getFile();
if (f == null || !f.exists())
return;
TaglibHelper helper = TaglibHelperManager.getInstance().getTaglibHelper(f);
String decl = ""; //$NON-NLS-1$
List problems = new ArrayList();
CustomTag tag = helper.getCustomTag(tagToAdd, getStructuredDocument(), customTag, problems);
TaglibVariable[] taglibVars = tag.getTagVariables();
fTranslationProblems.addAll(problems);
/*
* Add AT_BEGIN variables
*/