Bug 131243 Open invalid report design.
Open a invalid report design should switch to XML Source editor page and can't switch to other pages, when the source is correct user can switch to layout and other pages.
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/ui/editors/pages/ReportXMLSourceEditorFormPage.java
*/
	public void setActive( boolean active )
	{
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.forms.editor.IFormPage#isActive()
	 */
	public boolean isActive( )
	{
		return false;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.forms.editor.IFormPage#canLeaveThePage()
	 */
	public boolean canLeaveThePage( )
	{
		if ( isDirty( ) )
		{
			MessageDialog prefDialog = new MessageDialog( UIUtil.getDefaultShell( ),
					Messages.getString( "XMLSourcePage.Error.Dialog.title" ),
					null,
					Messages.getString( "XMLSourcePage.Error.Dialog.Message.PromptMsg" ),
					MessageDialog.INFORMATION,
					new String[]{
							Messages.getString( "XMLSourcePage.Error.Dialog.Message.Yes" ),
							Messages.getString( "XMLSourcePage.Error.Dialog.Message.No" ),