Bug 147852 [regression]Combo/listbox parameter doesn't work when put in parameter group
Description: Combo/listbox parameter doesn't work when put in parameter group Steps to reproduce: 1. New a prameter group 2. Insert a textbox parameter 3. Insert a combo/listbox parameter, input several values 4. Preview and select parameter values Expected result: Values can be selected Actual result: Once you selected a value from combo/listbox parameter list, the list would become empty.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ScalarParameterBean.java
String toolTip = ""; 
		
		if ( parameter != null && parameter.getHelpText( ) != null )
		{
			toolTip =  parameter.getHelpText( ); 
		}
		return ParameterAccessor.htmlEncode( toolTip );
	}
	/**
	 * @return Returns the isValueInList.
	 */
	public boolean isValueInList( )
	{
		return valueInList;
	}
	
	/**
	 * @param valueInList The isValueInList to set.
	 */
	public void setValueInList( boolean valueInList )
	{
		this.valueInList = valueInList;
	}
	
	/**
	 * @return Returns the parameter.
	 */
	public ParameterDefinition  getParameter( )
	{
		return parameter;