How can we change the visibility of the drop-down list after its creation?

I create a QML document with three drop-down lists.  Depending on how "trans_type" is selected, only to drop Extra should be displayed.  If the option "account" is selected, the drop-down list is visible and the DD category is hidden.  The reverse is true if the 'category' option is selected.

Here's how I build my QML document:

void Testing::updateFields()
{
    if (m_form.isNull())
        return;

    // Clear all fields from the form
    m_form->removeAll();

    // Clear the internal mapping
    m_fields.clear();

    //get the transaction page ready
    QmlDocument *qml = QmlDocument::create("asset:///transaction.qml").parent(this);

    DropDown* trans_type = qml->createRootObject();
    trans_type = DropDown::create().title("Transaction Type");
    trans_type->add(Option::create().text("Accounts").value("0"));
    trans_type->add(Option::create().text("Categories").value("1"));
    trans_type->setSelectedIndex(0);
    connect(trans_type, SIGNAL(selectedIndexChanged (int)), this, SLOT(onDDChange(int)));
    m_form->add(trans_type);

    DropDown* account_dd = qml->createRootObject();
    account_dd = DropDown::create().title("Account");
    account_dd->add(Option::create().text("No Account").value("0"));
    //... code to populate account drop down here...
    account_dd->setSelectedIndex(0);
    m_form->add(account_dd);

    DropDown* category_dd = qml->createRootObject();
    category_dd = DropDown::create().title("Category").visible(false);
    category_dd->add(Option::create().text("No Category").value("0"));
    //... code to populate category drop down here...
    category_dd->setSelectedIndex(0);
    m_form->add(category_dd);

}

Everything is displayed properly on the page.  onDDChange is called and it shows a Toast that the option has been selected.  Here is what I currently have in onDDChange:

void Testing::onDDChange(const int &info)
{
    QString msg = "Switched To: ";
    if(info == 0) {
        msg = msg + "Account";
    } else if(info==1) {
        msg = msg + "Category";
    } else {
        msg = msg + "Unrecognized";
    }
    showToast(msg);
}

I can't figure out how to get the drop down lists to be visible/hidden depending on the needs.  There is a function "setVisible()" for the drop, but I can not understand how to operate without the app crashing.  http://developer.BlackBerry.com/Cascades/reference/bb__cascades__dropdown.html#function-setVisible-v...

My questions are:

1. How can I change the visibility of the appropriate dropdown lists in a different function when the status of the main drop-down list is changed?

2. is there a way to define an id for drop-down lists?  If not, how am I supposed to go into the drop-down lists in a variable later so I can receive their value or change the visibility?

Any help would be great.  I've been struggling with this for a while.

There are a number of methods you could use signals and slots between your code and the QML or something simple is assign "objectName" as a property, then this search in C++.

http://developer.BlackBerry.com/Cascades/documentation/dev/integrating_cpp_qml/

Something like

DropBox db = mRootContainer->findChild("dropboxname");
db->setVisible(true);

Tags: BlackBerry Developers

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