[SelectField] Keypress does not focus on any option

[zsinryu]

For select field, if we press keyboard, it should focus on the option start with the letter same as key press.

Give a simple select with 3 options:

<Select value={this.state.age} onChange={this.handleChange} inputProps={{ name: 'age', id: 'age-simple', }} > <MenuItem value=""> <em>None</em> </MenuItem> <MenuItem value={1}>One</MenuItem> <MenuItem value={10}>Ten</MenuItem> <MenuItem value={50}>Fifty</MenuItem> </Select>

Expected Behavior

Press O, the first option should be focused
Press F, the last option should be focused

Current Behavior

Press O, T or F does on the keyboard does not have any action.

Tech	Version
Material-UI	1.0.0-beta.30
React	16.2.0
browser	Chrome
etc

[oliviertassinari]

Duplicate of #8191