Bug 168026 Still use the existing data binding even though the aggregate is different
I had a table in which a data binding which aggregates on a group. When I insert a new data item in the report, although the expressions are same, it aggregates on All, then it refered to the existing data binding. The expected behavior would be a new data binding is created with different aggregates.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ScalarParameterHandle.java
/**
	 * Returns the control type for this parameter. Control types are one of
	 * constants defined in <code>DesignChoiceConstants</code>:
	 * 
	 * <ul>
	 * <li><code>PARAM_CONTROL_TEXT_BOX</code>
	 * <li><code>PARAM_CONTROL_LIST_BOX</code>
	 * <li><code>PARAM_CONTROL_COMBOBOX</code>
	 * <li><code>PARAM_CONTROL_RADIO_BUTTON</code>
	 * <li><code>PARAM_CONTROL_CHECK_BOX</code>
	 * </ul>
	 * 
	 * @return the control type for the UI to display the parameter
	 * 
	 * @see org.eclipse.birt.report.model.api.elements.DesignChoiceConstants
	 */
	public String getControlType( )
	{
		return getStringProperty( CONTROL_TYPE_PROP );
	}
	/**
	 * Sets the control type for this parameter. Control types are one of
	 * constants defined in <code>DesignChoiceConstants</code>:
	 * 
	 * <ul>
	 * <li><code>PARAM_CONTROL_TEXT_BOX</code>
	 * <li><code>PARAM_CONTROL_LIST_BOX</code>
	 * <li><code>PARAM_CONTROL_COMBOBOX</code>
	 * <li><code>PARAM_CONTROL_RADIO_BUTTON</code>
	 * <li><code>PARAM_CONTROL_CHECK_BOX</code>