ngSwitch + ion-select is not working

Ionic Framework ionic-v3
1

Select won’t show itself, when adding inside an item tag and also inside ngSwitch, can anyone help?

<ion-list>
                <form (ngSubmit)="onSubmit()" novalidate>
                    
                  <ion-item *ngFor="let item of Questions">

                    <div [ngSwitch]="item.QType">                        

                        <div class="stack-div item" *ngSwitchCase="'Select'" >
                            <label id="lblGroup">{{item.QName}}</label>
                            <div>
                            <!-- <ion-select id="item.QId">
                             <ion-option *ngFor="let list of item.QOptions" value="{{list}}">{{list}}</ion-option>
                            </ion-select> -->
                            <ion-select id="item.QId">
                             <ion-option value="1">value1</ion-option>
                             <ion-option value="2">value1</ion-option>
                             <ion-option value="3">value1</ion-option>
                             <ion-option value="4">value1</ion-option>          
                            </ion-select>
                            </div>
                        </div>

                    </div>

                </ion-item>
                    
                <button type="submit" class="btnSubmit" ion-button color="dark" block>Submit</button>
            </form>
                
        </ion-list>