poup with multiselect should show when click on button.

I want to add a button inside webix data table. When user click on button the popup will appear with multiselct.If user select two item from drop down then that field should added as two column in webix data table.

I want to do like

http://webix.com/snippet/b58f897d

Here is my code showing error “GPL version does not support multiselect”.

webix.ui({
    view:"window",
    id:"my_win",
    head:"My Window",
  	position:'center',
    body:  { view:"multiselect", id:"multi", options:[
    { id:1, value:"Select Column" },
    { id:2, value:"Dan Simons" },   
    { id:3, value:"Mohit Tripathi" }, 
] }
})
  
  
webix.ui({
  view:"button", label:"Click me", id:"my_button", click: function(){
  	$$('my_win').show()
  }
    
});

Hi,

Multiselect is available only in Webix Pro.