dhtmlxCombo autocomplete/filter only defined values

Suite and Optimus Suite 5
#1

Hello,

I have a dhtmlxCombo with the values 00-59 (seconds).
I populate it like this:

var cboMin = new dhtmlXCombo("txtmin", "alfa", 50);

for (i=0;i<=59;i++){
	tmp=i;
	if (tmp<10){
		tmp="0"+tmp;
	}
	cboMin.addOption([[i,tmp]]);
}

I want people to be able to type values from 00-59, but not letters and not numeric values higher than 59.
I already tried the readonly option, but then they can’t type anything. cbomin.readonly(true);
With filteringmode and autocomplete I can enter values that not are in the combobox (00-59), so that’s NOT what I want. Is there a way to do this?

cboMin.enableFilteringMode(true); 
cboMin.enableAutocomplete(true);

Maybe empty the combobox if they enter a value that’s not in the combobox?

#2

Never mind, allowFreeText(false) in combination with the 2 others did the trick:

cboMin.enableFilteringMode(true);
cboMin.enableAutocomplete(true);
cboMin.allowFreeText(false);