title: How to get the active part in a particular partstack in eclipse e4?
body: <p>I have a button which creates parts. I need to get the active part that is currently visible in he part stack and I am storing it as a key for some value. How should I get the active part?
  I have used the following code but it is getting all the parts in the partstack. </p>
  
  <pre><code>            MPart graphpart = partService
                      .createPart("com.abc.xyz.project.partDescriptor.1");
              MPartStack stack = (MPartStack) modelService.find(
                      "com.abc.xyz.project.partstack.2", application);
  
              for (int i = 0; i &lt; stack.getChildren().size(); i++) {
                  if (stack.getChildren().get(i).isVisible()) {
                      System.out.println("values"
                              + ((MPart) stack.getChildren().get(i)).getLabel());
                      application.getTransientData().put(
                              ((MPart) stack.getChildren().get(i)).getLabel(),
                              selectedFiles);
                  }
              }
  </code></pre>