Bug 146796 Error message pop up if display text contain non-digital char when add next item
Description: In decimal type parameter creation,display type is "list box", Error message pop up if "display text" contain non-digital char when add next item. Steps: 1.Create a new decimal parameter 2.Set display type as "list box" 3.Input one item: value:1, display text:test 4.Input another item: Value:2 Actual result: error message pop up: The display text already exists! Expected result: Input item succussfully.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
public void keyReleased( KeyEvent e )
			{
				
				if ( e.keyCode == SWT.DEL )
				{
					deleteRow( );
				}
			}
		} );
		String[] columns;
		int[] columnWidth;
		CellEditor[] cellEditors;
		
		
		columns = new String[]{
				null, COLUMN_IS_DEFAULT, COLUMN_VALUE, COLUMN_DISPLAY_TEXT
		};
		columnWidth = new int[]{
				20, 70, 145, 145,
		};
		cellEditors = new CellEditor[]{
				null,
				null,
				new TextCellEditor( table ),
				new TextCellEditor( table )
		};
		for ( int i = 0; i < columns.length; i++ )
		{
			TableColumn column = new TableColumn( table, SWT.LEFT );
			column.setResizable( columns[i] != null );