title: How to make image to fill qml controls button
body: <p>I want icon to fill <code>Button</code>. Here is code:</p>
  
  <pre><code>import QtQuick 2.3
  import QtQuick.Controls 1.2
  import QtQuick.Layouts 1.1
  import QtQuick.Window 2.2
  
  Window{
      id: root
      title: "settings"
      flags: Qt.Dialog
      minimumHeight: 700
      minimumWidth: 700
      maximumHeight: 700
      maximumWidth: 700
  
      ColumnLayout{
          id: columnLayout
          anchors.fill: parent
          RowLayout{
              Button{
                  iconSource: "images/1x1.png"
                  checkable: true
                  checked: true
                  Layout.minimumWidth: 100
                  Layout.minimumHeight: 100
                  }
  
              Button{
                  iconSource: "images/1x2.png"
                  checkable: true
                  checked: false
                  Layout.minimumWidth: 100
                  Layout.minimumHeight: 100
              }
              Button{
                  iconSource: "images/2x1.png"
                  checkable: true
                  checked: false
                  Layout.minimumWidth: 100
                  Layout.minimumHeight: 100
              }
              Button{
                  iconSource: "images/2x2.png"
                  checkable: true
                  checked: false
                  Layout.minimumWidth: 100
                  Layout.minimumHeight: 100
              }
          }
          Rectangle{
              visible: true
              implicitHeight: 600
              implicitWidth: 700
              color: "red"
          }
      }
  }
  </code></pre>
  
  <p>Button size is 100*100 pixels but image size is much lower. How to make image to be as big as button</p>