Hide, show dialog query select button.

[Ventainais]

Greetings!


I'm creating a new report and added to it a datasource.
The report is run from extended RunBaseReport Class and in the dialog method
I create a dialog in witch I added an enum type combobox.

What I am trying to do is hide the select button depending on what value the user has selected.

public Object dialog(Object _dialog)
{
    InventFertilizerReportDesign    inventFert;
    ;
    dlg     = super(_dialog);

    dlgFldDesignVal     = dlg.addField(typeId(InventFertilizerReportDesign), "@LVT76");
    dlgFldDesignVal.value(reportDesign);
    dlgFldDateFrom      = dlg.addField(typeId(TransDate), "@SYS5209");
    dlgFldDateFrom.value(dateFrom);
    dlgFldDateTo        = dlg.addField(typeId(TransDate), "@SYS80662");
    dlgFldDateTo.value(datoTo);
    dlgFldShopId        = dlg.addField(typeId(ReShopId));
    dlgFldShopId.value(shopId);

    dlgFldShowPrice     = dlg.addField(typeId(NoYes), "@LVT4117");
    dlgFldShowWeight    = dlg.addField(typeId(NoYes), "@LVT4119");

    return dlg;
}

In method "dialogPostRun" I set controlMethodOverload to true

super(dialog);

    dialog.dialogForm().formRun().controlMethodOverload(true);
    dialog.dialogForm().formRun().controlMethodOverloadObject(this);

public int Fld6_1_selectionChange()
{
    int     ret;
    Object          mainFormGroupOrig;
    Object  control = dlg.formRun().controlCallingMethod();

    ret = control.selectionChange();

    switch (dlgFldDesignVal.value())
    {
        case InventFertilizerReportDesign::AmmoniaNitrateDesign :
            showQueryValues = true;
            dlgFldDateFrom.visible(true);
            dlgFldDateTo.visible(true);
            dlgFldShopId.visible(true);
            dlgFldShowPrice.visible(false);
            dlgFldShowWeight.visible(false);
            break;
        case InventFertilizerReportDesign::SalesReport          :
            showQueryValues = false;
            dlgFldDateFrom.visible(false);
            dlgFldDateTo.visible(false);
            dlgFldShopId.visible(false);
            dlgFldShowPrice.visible(true);
            dlgFldShowWeight.visible(true);
            break;
    }

    reportDesign = dlgFldDesignVal.value();

    return ret;
}

 public boolean showQueryValues()
{;

    return showQueryValues;
}

as simple it may be I can't figure out how to hide or show the button.