title: Using InputMask in QML
body: <p>I have a small display window, that should hold an InputMask like "0000.00". When clicking on the Number-Buttons from 0 to 9, the display should show the respective numbers, for example: 0345.89
  Here is my code:</p>
  
  <pre><code>TextInput {
      id: displayNumbers6Text
      cursorVisible: true
      focus: true
      validator: RegExpValidator {
          regExp: /[0-9]+/
      }
      inputMask: "0000.00"
      maximumLength: 7
  }
  </code></pre>
  
  <p>And for the Buttons:</p>
  
  <pre><code>Button {
       width: parent.width*0.3
       height: parent.height*0.15
       buttonColor: "#000000"
       MouseArea {
            anchors.fill: parent
            onClicked: {
                  displayNumbers6Text.text = "1"
            }
       }
  }
  </code></pre>
  
  <p>But it doesn't function. What am I doing wrong?</p>