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
listLimit.setEditable( false );
	}
	private void switchToDynamic( )
	{
		Composite composite = new Composite( valueArea, SWT.NONE );
		GridData gd = new GridData( GridData.FILL_HORIZONTAL );
		gd.horizontalSpan = 2;
		composite.setLayoutData( gd );
		composite.setLayout( UIUtil.createGridLayoutWithoutMargin( 3, false ) );
		createLabel( composite, LABEL_SELECT_DATA_SET );
		dataSetChooser = new Combo( composite, SWT.BORDER | SWT.READ_ONLY );
		dataSetChooser.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		dataSetChooser.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				refreshColumns( false );
			}
		}
		);
		createDataSet = new Button( composite, SWT.PUSH );
		createDataSet.setText( BUTTON_CREATE_DATA_SET );
		setButtonLayoutData( createDataSet );
		createDataSet.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				new NewDataSetAction( ).run( );
				refreshDataSets( );
			}
		} );
		createLabel( composite, LABEL_SELECT_VALUE_COLUMN );