Group Toolbar button not rendered on mobile device

Receiving the console warning: theme.min.js:9 Ignoring the ‘selectdropdown’ toolbar button. Group toolbar buttons are only supported when using floating toolbar mode and cannot be nested.

The application is running in Chrome on an Android phone. The same application running in Chrome on a PC does produce the expected result.

My spec:

var spec = {
	selector: '#' + arr[i].id
	,toolbar_mode:'floating'
	,plugins: [ 'lists' ]
	,menubar: false
	,browser_spellcheck: true
	,contextmenu: false
	,inline:true
	,toolbar: [
		'bold italic underline | forecolor backcolor | removeformat selectdropdown',
		'undo redo | selectall | alignleft aligncenter alignright | numlist bullist'
	]
	,toolbar_groups: {
		selectdropdown: {
			icon: 'more-drawer',
			tooltip: 'Format',
			items: 'fontsizeselect formatselect'
		}
	}
	,block_formats: 'Normal=p; Header=h3;'
};

The image on the phone:

The image on the PC:

[lostkeys]

@mateusfmello and everyone else, try add the following to your config and see if it solves the issue (it works on my device)

mobile: {
    toolbar_mode: 'floating'
},

[WilliamAdolph]

have you solve this problem?i also got this problem