Bug 189598 [linux][smoke]GUIException when new style in Layout or through main menu[0300]
Description: GUIException when new style in Layout or through main menu Build number:2.2.0.v200705291039 Steps to reproduce: 1. New a report. 2. New a style by right click in Layout. 3. New a style through main menu Expected result: A new style is inserted. Actual result: Fail to new style and throw exception. Error log:N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/command/SelectionHandler.java
*/
	protected IStructuredSelection getSelection( )
	{
		IEvaluationContext context = (IEvaluationContext) event.getApplicationContext( );
		Object selectVariable = context.getVariable( ISources.ACTIVE_CURRENT_SELECTION_NAME );
		if ( selectVariable instanceof IStructuredSelection )
		{
			return (IStructuredSelection) selectVariable;
		}
		else
		{
			return new StructuredSelection( selectVariable );
		}
	}
	/**
	 * Gets the activity stack of the report
	 * 
	 * @return returns the stack
	 */
	protected CommandStack getActiveCommandStack( )
	{
		return SessionHandleAdapter.getInstance( ).getCommandStack( );
	}
	/**
	 * Gets models of selected elements
	 * 
	 * @return
	 */
	protected List getElementHandles( )
	{