UI5: Dropdown box mandatory

Hi,

I'm trying to write some code to check if the user has selected anything in the drop down box.

For input fields, you can set:

this.byId('description').setValueState(sap.ui.core.ValueState.Error)

And the input field in error would have a red box around it marked as error.

However in sap.m.Select there is no such thing as "ValueState".

How should we handle this?

Cheers

Michael.