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
needSort.setSelection( !inputParameter.isFixedOrder( ) );
				}
			}
			else
			{
				needSort.setEnabled( false );
				needSort.setSelection( false );
				checkBoxChange( needSort, CHECKBOX_SORT );
			}
			if ( DesignChoiceConstants.PARAM_CONTROL_TEXT_BOX.equals( getSelectedControlType( ) )
					|| PARAM_CONTROL_LIST.equals( getSelectedControlType( ) ) )
			{
				allowBlank.setEnabled( true );
				allowNull.setEnabled( true );
				doNotEcho.setEnabled( true );
				if ( dirtyProperties.containsKey( CHECKBOX_ALLOW_BLANK ) )
				{
					allowBlank.setSelection( getProperty( CHECKBOX_ALLOW_BLANK ) );
				}
				else
				{
					allowBlank.setSelection( inputParameter.allowBlank( ) );
				}
				if ( dirtyProperties.containsKey( CHECKBOX_ALLOW_NULL ) )
				{
					allowNull.setSelection( getProperty( CHECKBOX_ALLOW_NULL ) );
				}
				else
				{
					allowNull.setSelection( inputParameter.allowNull( ) );