Gets the tab for whom the given component is a child.
Note: This is not a method for retrieving the tab for a specific content
component. This method is only useful for finding the Tab for components that
have been added to a Tab.
Parameters: c - the component the tab or null if component is not a child of any tab
Gets the tabbed panel for whom the given component is a child
Parameters: c - the component the tabbed panel or null if component is not a child of any tabbed panel
Gets the TabbedPanelContentPanel for whom the given component is a child
Parameters: c - the component the content panel or null if component is not a child of anytabbed panel content panel