title: openui5: How to get current JSON model element in RowRepeater
body: <p>I'm having trouble getting the current JSON model element which is bound to a RowRepeater element.
  With tables and lists, I would simply retrieve the current index (or indices) and based on these values, I point to the matching element in my JSON model.</p>
  
  <p>However, the RowRepeater element does not have a current index property. As I feel I should be able to retrieve the current element directly, as opposed to indirectly by the current index, is there a better, uniform way to retrieve the current element?</p>
  
  <p>Sample code for model :</p>
  
  <pre><code>    var mydata = {
          "data": [
              {
                  "key": "67b895bf-8d89-11e3-94a7-0000005341de",
                  "name": "my 1st item"
              },
              {
                  "key": "7780de05-8d83-11e3-bec4-0000005341de",
                  "name": "my 2nd item"
              }
          ]
      };
      var oModel = new sap.ui.model.json.JSONModel();
      oModel.setData(dummydata);
      sap.ui.getCore().setModel(oModel);
  </code></pre>
  
  <p>Sample code for RowRepeater (I want to retrieve the current 'key' upon pressing the delete icon):</p>
  
  <pre><code>    var oRowRepeater = new sap.ui.commons.RowRepeater();
  
      //create the template control that will be repeated and will display the data
      var oRowTemplate = new sap.ui.commons.layout.MatrixLayout();
  
      var  matrixRow, matrixCell, control;
  
      // main row
      matrixRow = new sap.ui.commons.layout.MatrixLayoutRow();
  
      //Text
      control = new sap.ui.commons.TextView();
      control.bindProperty("text","name");
  
      //add content to cell, cell to row
      matrixCell = new sap.ui.commons.layout.MatrixLayoutCell();
      matrixCell.addContent(control);
      matrixRow.addCell(matrixCell);
  
      //delete icon
      var icon = new sap.ui.core.Icon({
          src: sap.ui.core.IconPool.getIconURI("delete"),
          size: "16px",
          color: "#333",
          activeColor: "#BBB",
          hoverColor: "#888",
          width: "60px",
      });
      icon.attachPress(function(oEvent) {
          sap.ui.commons.MessageBox.alert("TODO: Implement delete based on current/data/?/key");
      });
  
      //add content to cell, cell to row
      matrixCell = new sap.ui.commons.layout.MatrixLayoutCell({ hAlign : sap.ui.commons.layout.HAlign.Right });
      matrixCell.addContent(icon);
      matrixRow.addCell(matrixCell);
  
      // add row to matrix
      oRowTemplate.addRow(matrixRow);
  
      //attach data to the RowRepeater
      oRowRepeater.bindRows("/data", oRowTemplate);
  </code></pre>