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/InsertGroupActionFactory.java
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.action.Action#isEnabled()
	 */
	public boolean isEnabled( )
	{
		boolean canContain = false;
		if ( getTableEditPart( ) != null )
		{
			canContain = ( (TableHandle) getTableEditPart( ).getModel( ) )
					.canContain( TableHandle.GROUP_SLOT,
							ReportDesignConstants.TABLE_GROUP_ELEMENT );
		}
		if ( getListEditPart( ) != null )
		{
			canContain = ( (ListHandle) getListEditPart( ).getModel( ) )
					.canContain( ListHandle.GROUP_SLOT,
							ReportDesignConstants.LIST_GROUP_ELEMENT );
		}
		return canContain;
	}
	/**
	 * Runs action.
	 * 
	 */
	public void run( )
	{
		if ( Policy.TRACING_ACTIONS )