added demo source code in tsx

docs/data/material/components/selects/SelectSmall.tsx

@@ -0,0 +1,33 @@
+import * as React from 'react';
+import InputLabel from '@mui/material/InputLabel';
+import MenuItem from '@mui/material/MenuItem';
+import FormControl from '@mui/material/FormControl';
+import Select, { SelectChangeEvent } from '@mui/material/Select';
+
+export default function SelectSmall() {
+  const [age, setAge] = React.useState('');
+
+  const handleChange = (event: SelectChangeEvent) => {
+    setAge(event.target.value);
+  };
+
+  return (
+    <FormControl sx={{ m: 1, minWidth: 120 }} size="small">
+      <InputLabel id="demo-simple-select-disabled-label">Age</InputLabel>
+      <Select
+        labelId="demo-select-small"
+        id="demo-select-small"
+        value={age}
+        label="Age"
+        onChange={handleChange}
+      >
+        <MenuItem value="">
+          <em>None</em>
+        </MenuItem>
+        <MenuItem value={10}>Ten</MenuItem>
+        <MenuItem value={20}>Twenty</MenuItem>
+        <MenuItem value={30}>Thirty</MenuItem>
+      </Select>
+    </FormControl>
+  );
+}