function getWaitForTheme() {
		var sWaitForTheme = BaseConfig.get({name: "sapUiXxWaitForTheme", type: BaseConfig.Type.String, external: true}).toLowerCase();

		if (sWaitForTheme === "true" ) {
			sWaitForTheme = "rendering";
		}
		if ( sWaitForTheme !== "rendering" && sWaitForTheme !== "init" ) {
			// invalid value or false from legacy boolean setting
			sWaitForTheme = undefined;
		}

		return sWaitForTheme;
	}
Returns the waiting behavior for the initial theme loading.
Possible values are:
<ul>
<li>undefined (default):
    By default neither the initialization of the SAPUI5 Core nor the first rendering
    wait for the configured theme to be loaded.
</li>
<li>"rendering":
     The first (initial) rendering of the application will be delayed until the theme
     has been loaded and applied (until Core.isThemeApplied()).
     Helps to avoid FOUC (flash of unstyled content).
</li>
<li>"init":
     Same as "rendering", but additionally delays the init event of theSAPUI5 Core until
     the configured theme has been loaded. Application code that waits for this event can
     then rely on the theming information to be present,
     e.g. for calling sap.ui.core.theming.Parameters.get
</li>
</ul>

@returns {string} the configured waiting behavior for the initial theme loading