====== Drop Down Menu ======

==== Example ====
**HTML**
<code html>
<ion-content padding>    
    <drop-down-menu [itemNames]="dropDownItemNames" (valueChange)="onValueChange($event)"></drop-down-menu>
    <br />
    {{dropDownValue}}
</ion-content>
</code>
**TypeScript**
<code javascript>
export class DemoPage{
   
    private dropDownItemNames = ['aaa', 'bbb', 'ccc'];
    private dropDownValue: string = '';

    constructor() {
        this.dropDownValue = this.dropDownItemNames[0];
    }

    //Function to call when the dropdown value changes.
    onValueChange(data){
        this.dropDownValue = data.value;
    }   
}
</code>