I had the same requirement and here is what i did to get them.

Step 1: get the project explorer view part from that get the selection provider

Step 2: Get the tree from the selection provider and get the appropriate project that you need. All the projects will be a first level leaf in this tree.

Step 3: Get the TreeItem of the project on which you need to get the rtc component from.

              (TreeItem can be got either by getSelection or by searching the each treeitem for the project of your concern.

Step 4: Once the required tree item found, get the Text from the tree item and split the text. and get your rtc component name.

Code snippet for your help:

IWorkbenchPart viewpart  = page.findView("org.eclipse.ui.navigator.ProjectExplorer");

Tree tree = (Tree) ((TreeViewer) part.getSite().getSelectionProvider()).getControl();
TreeItem[] selTree = tree.getSelection();

choose the tree item that you need.

String decoratedName = treeItem.getText().split(" ");

String[] temp = decoratedName.split(" ");
if (temp.length < 2 || null == temp[1]) {
 return null;
}

String ComponentName =  temp[2].trim().replace(")", "");

(no exception handling shown above, please take care)

Hope this help.