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
{
					defaultValue = choice.getValue( );
				}
				refreshValueTable( );
				updateMessageLine( );
				updateButtons( );
				changeDefault.getParent( ).layout( );
			}
		} );
		delete = new Button( buttonBar, SWT.PUSH );
		delete.setText( BUTTON_LABEL_DELETE );
		setButtonLayoutData( delete );
		delete.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				deleteRow( );
			}
		} );
		createPromptLine( tableArea );
		updateTableButtons( );
	}
	private void switchToText( )
	{
		createDefaultEditor( );
		createLabel( valueArea, null );
		createPromptLine( valueArea );
	}
	private void switchToStatic( )
	{
		changeControlType( );