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
Assert.isLegal( input instanceof ScalarParameterHandle );
		inputParameter = (ScalarParameterHandle) input;
	}
	protected boolean initDialog( )
	{
		Assert.isNotNull( inputParameter );
		nameEditor.setText( inputParameter.getName( ) );
		if ( !StringUtil.isBlank( inputParameter.getPromptText( ) ) )
		{
			promptTextEditor.setText( inputParameter.getPromptText( ) );
		}
		helpTextEditor.setText( UIUtil.convertToGUIString( inputParameter.getHelpText( ) ) );
		if ( inputParameter.getValueType( )
				.equals( DesignChoiceConstants.PARAM_VALUE_TYPE_STATIC ) )
		{
			staticRadio.setSelection( true );
			for ( Iterator iter = inputParameter.getPropertyHandle( ScalarParameterHandle.SELECTION_LIST_PROP )
					.iterator( ); iter.hasNext( ); )
			{
				SelectionChoiceHandle choiceHandle = (SelectionChoiceHandle) iter.next( );
				choiceList.add( choiceHandle.getStructure( ) );
			}
		}
		else
		{
			dynamicRadio.setSelection( true );
		}