How to Call a UI Page in Dashboard tabs

[KAIFEE]

I have  a requirement to display a UI Page in a dashboard tab.

function sections() {
return {
'Demo Calendar': {'uiPageName': 'csm_calendar_report' },
};
}

function render() {
var uiPageName = renderer.getPreferences().get("uiPageName");
return renderer.getRenderedPage(uiPageName);
}

function getEditLink() {
var uiPageName = renderer.getPreference('uiPageName');
return 'sys_ui_page.do?sysparm_query=' + encodeURIComponent('name=' + uiPageName);
}
I tried this code but getting a null value.