public void doTheChange(EObject target, String toolType){
//target is the clicked object that will be replaced
Tool tool=(Tool)target;
if("andTool".equals(toolType){
    //we create new instance
   AndTool andTool=MyMetamodelFactory.createAndTool(); 
   //we retrieve the parent Action
    Action action=(Action)target.eContainer();
    //we replace the tool
     action.setTool(andTool)
}else{
     ... do the same for or tool
}
Then Set the coordinate
}