Mulitple select in sencha touch forms?

[buerthel]

Hello,

how can i build a "mulitple select box" in sencha touch forms?

I am using xtype selectfield:

Sample Code:

{
"xtype":"selectfield",
"label":"Hauptinteresse",
"name":"led_Hauptinteresse",
"options": [{
"text":"Hardware",
"value":"Hardware"
},{
"text":"Software",
"value":"Software"
},{
"text":"Dienstleistung",
"value":"Service"
}]
}

Many thanks in advance!
Best regards,
FRB