Cannot get ref with new withUtilsDateTimePickerWrapper

[wieseljonas]

Environment

Tech	Version
material-ui-pickers	^v1.0.0-rc.2
material-ui	^1.0.0-beta.34
React	^16.2.0
Browser	Chrome
Platform

Steps to reproduce

              <DateTimePicker
                label="Due date"
                id="datetime-picker"
                autoOk
                innerRef={node => {
                  this.dateTimePicker = node;
                }}
                onChange={this.handleDateTimePickerChange}
                margin="normal"
                fullWidth
                returnMoment={false}
              />

Expected behavior

Should be able to access picker ref to do things like this.dateTimePicker.wrapper.open();

Actual behavior

Get this error

Warning: Stateless function components cannot be given refs. Attempts to access this ref will fail.

[dmtrKovalenko]

Fixed in rc-3