Selectbox value

I have a question about the selectbox of toolbar.

I need that value when I make an update of an element at the dhtmlxgrid, so I’d like to know if it is posible to get that value in PHP or I have to use a hidden tag of some sort?

I’m not sure which toolbar do you mean, but in case of dhtmlxToolbar, the value of selectbox can be obtained in next way

toolbar.getItem(ID).selElement.value;