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
{
			errorMessageLine.setText( errorMessage );
			errorMessageLine.setImage( ERROR_ICON );
		}
		else
		{
			errorMessageLine.setText( "" ); 
			errorMessageLine.setImage( null );
		}
		if ( promptMessageLine != null && !promptMessageLine.isDisposed( ) )
		{
			if ( DesignChoiceConstants.PARAM_TYPE_DATETIME.equals( getSelectedDataType( ) ) )
			{
				promptMessageLine.setText( LABEL_DATETIME_PROMPT );
			}
			else
			{
				promptMessageLine.setText( "" ); 
			}
		}
		updateButtons( );
	}
	private String validateName( )
	{
		String name = nameEditor.getText( ).trim( );
		if ( name.length( ) == 0 )
		{
			return ERROR_MSG_NAME_IS_EMPTY;
		}
		if ( !name.equals( inputParameter.getName( ) )