Problem with inherited RunBase class

[ist]

Hi,
First I apopogize for my english.
The my problem is:
I have class "Class1"inheritor of RunBase.In this class I have overrided dialog(), getFromDialog() and Init() methods.I have other class "Class2"who inherited mentioned above Class1.In second class I have overrided pack() and unpack() methods.When I have two instantions of "Class2" I do not close first instantion while second is opened.
How I resolve this problem?
Thank's you in advance.

Class1:

class Class1 extends RunBase
{
    NoYes checkThing;
    DialogField dialogCheckThing;
}
 
protected Object dialog()
{
    DialogRunBase dialog;
    ;
    dialog = super();
    dialogCheckThing = dialog.addFieldValue(typeid(NoYes), checkThing);
    return dialog;
}
 
public boolean getFromDialog()
{
    boolean ret;
    ret = super();
    checkThing = dialogCheckThing.value();
    return ret;
}

Class2:

class Class2 extends Class1
{
    #define.CurrentVersion(1)
    #localmacro.CurrentList
        checkThing
    #endmacro
}
 
public container pack()
{
    return [#CurrentVersion, #CurrentList];
}
 
public boolean unpack(container packedClass)
{
    boolean         _ret = false;
    Integer         _version    = conPeek(packedClass,1);
    switch (_version)
    {
        case #CurrentVersion:
            [_version, #CurrentList] = packedClass;
            _ret = true;
            break;
    }
    return _ret;
}
 
public void run()
{
    super();
    this.prompt();
}
 
public static void main(Args args)
{
    Class2 class2 = new Class2();
    ;
    if(class2.init())
    {
        class2.run();
    }
}