Bug 145991 [Regression]Invalid data set should not be allowed to drag or "Insert in layout"
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DataSetHandle.java
*/
	public PropertyHandle getPropertyHandle( String propName )
	{
		if ( PARAMETERS_PROP.equals( propName ) )
			return new DataSetParametersPropertyHandle( this, propName );
		return super.getPropertyHandle( propName );
	}
	/**
	 * sets the cached row count property value.
	 * 
	 * @throws SemanticException
	 */
	public void setCachedRowCount( int count ) throws SemanticException
	{
		setIntProperty( CACHED_ROW_COUNT_PROP, count );
	}
	/**
	 * Returns the value of cached row count property.
	 * 
	 * @return the row count.
	 */
	public int getCachedRowCount( )
	{
		return getIntProperty( CACHED_ROW_COUNT_PROP );
	}
	/**
	 * Represents the property handle which handles the structure list of data
	 * set parameters.
	 */
	final static class DataSetParametersPropertyHandle extends PropertyHandle