To create a ribbon combo you need to create a new Menu Function with the type Akioma.Swat.Studio.Menu.DynCombo.
Set the newly created Function for your required menu structure item.
It is also required to specify a createEvent on the menu structure item to populate the Ribbon Combo with options and to select the default value.
Example populating Ribbon Combo Options
akioma.customer.getRibbonComboOptions = function( self ) { // get target const oTarget = self.controller; // get options akioma.invokeServerTask( { name: 'Osiv.System.UiContextHandlingBT', methodName: 'GetComboOptions' }).done(function(oResult){ const oOptions = oResult.plcParameter.Options; // oOptions will be an array of { key, hdl, image } format element properties // add options to combo if (oOptions) oTarget.setComboOptions( oOptions); if(oOptions.length > 0) oTarget.optionSelected(oOptions[0].hdl); }) }