Bug 166015 Refactor designer actions to eclipse command framework
Eclipse command framework provide a more explicit way to manage UI actions contributions, we can take it's advantage to make our actions code more clean and maintainable.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/actions/ApplyStyleAction.java
*/
	public ApplyStyleAction( SharedStyleHandle handle )
	{
		this.handle = handle;
		setId( ID );
		if ( handle == null )
		{
			setText( Messages.getString( "ApplyStyleAction.actionLabel.none" ) ); 
		}
		else
		{
			if ( handle.getContainerSlotHandle( ).getElementHandle( ) instanceof ThemeHandle )
			{
				setText( ( (ThemeHandle) handle.getContainerSlotHandle( )
						.getElementHandle( ) ).getName( )
						+ "." 
						+ DEUtil.getEscapedMenuItemText( DEUtil.getDisplayLabel( handle,
								false ) ) );
			}
			else
			{
				setText( DEUtil.getEscapedMenuItemText( DEUtil.getDisplayLabel( handle,
						false ) ) );
			}
		}
	}
	/**
	 * @see org.eclipse.jface.action.Action#isEnabled()
	 */
	public boolean isEnabled( )