/**
 Initializes main menu of Vintasoft web document viewer.
 @param {object} docViewerSettings Settings of Vintasoft web document viewer.
*/
function __initMenu(docViewerSettings) {
    // get items of document viewer
    var items = docViewerSettings.get_Items();

    // get the main menu of document viewer
    var mainMenu = items.getItemByRegisteredId("mainMenu");
    // if main menu is found
    if (mainMenu != null) {
        // get items of main menu
        var mainMenuItems = mainMenu.get_Items();

        // get "Tools" menu in web document viewer
        var toolsToolbarPanel = mainMenuItems.getItemByRegisteredId("toolsMenuPanel");
        // get items of "Tools" menu
        var toolsToolbarPanelItems = toolsToolbarPanel.get_Items();

        // items for drop-down list
        var dropDownItems = ["None", "Accepted", "Completed", "Rejected", "Cancelled"];

        // an array that contains option-elements for drop-down list
        var selectOptions = [];
        // for each item in drop-down list
        for (var i = 0; i < dropDownItems.length; i++) {
            // create option-element for item
            selectOptions.push({
                name: dropDownItems[i],
                value: dropDownItems[i],
                localizationId: dropDownItems[i]
            });
        }

        // create a drop-down list
        var dropDownList = new Vintasoft.Imaging.UI.UIElements.WebUiLabelWithDropDownListJS({
            css: { width: "100px" },
            options: selectOptions,
            selectedValue: selectOptions[0]
        });

        // add drop-down list to the "Tools" menu in web document viewer
        toolsToolbarPanelItems.addItem(dropDownList);
    }
}