Bug 136027 [Smoke]the report with a gounp can not preview
Description: the report with a gounp can not preview Steps to reproduce: 1. new a datasource and a dataset 2. drag the dataset to the layout 3. Add a group on the table. save and preview. Actual result: "Error happened while running the report" is appeared.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
FormPage bindingPage = new DataSetColumnBindingsFormPage( tab,
				new DataSetColumnBindingsFormHandleProvider( ) );
		bindingPage.setInput( list );
		bindingItem.setText( TAB_BINDING );
		bindingItem.setControl( bindingPage );
		TabItem filterItem = new TabItem( tab, SWT.NONE );
		FormPage filterPage = new FormPage( tab,
				FormPage.NORMAL_FUNCTION,
				new FilterHandleProvider( ) {
					public int[] getColumnWidths( )
					{
						return new int[]{
								200, 100, 100, 100
						};
					}
				} );
		filterPage.setInput( list );
		filterItem.setText( TAB_FILTER );
		filterItem.setControl( filterPage );
		TabItem sortItem = new TabItem( tab, SWT.NONE );
		FormPage sortPage = new FormPage( tab,
				FormPage.NORMAL_FUNCTION,
				new SortingHandleProvider( ) {
					public int[] getColumnWidths( )
					{
						return new int[]{
								200, 100
						};
					}
				} );